Last updated: April 23, 2026· By Seckin Peker

Costume Guide

Rex Kwon Do Costume Guide
Napoleon Dynamite · Diedrich Bader · 2004

Do you think anybody wants a roundhouse kick to the face while I’m wearing these bad boys? Forget about it — American flag pants, star bandana, and five pieces of pure freedom.

Diedrich Bader Movies Napoleon Dynamite
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Quick Answer: To dress like Rex from Napoleon Dynamite, put on the black sport polo shirt, step into the American flag baggy pants, tie the red star bandana across your forehead, put on the yellow shooting glasses, and lace up the black running shoes. The American flag pants and star bandana together do all the character recognition work — once they’re on, you are Rex Kwon Do. Deliver “these are the pants of freedom” with total conviction and the character is complete.

Rex is the magnificently self-important martial arts instructor of Napoleon Dynamite (2004), played by Diedrich Bader. Operating out of a modest dojo in Preston, Idaho, Rex teaches a self-styled system of self-defence he calls Rex Kwon Do — a discipline built on confidence, patriotism, and the unwavering belief that his American flag pants are the most intimidating garment in martial arts history. A minor character who appears in only one sequence of the film, Rex generated some of Napoleon Dynamite’s most quoted lines and became one of the most recognisable faces in 2000s comedy. Five pieces, maximum impact, and a single quote that carries the entire evening: do you think anybody wants a roundhouse kick to the face while I’m wearing these bad boys? Forget about it.

Items Total5 Items
DifficultyVery Easy
Film2004
ActorDiedrich Bader
Rex Kwon Do costume guide infographic from Napoleon Dynamite showing black sport polo shirt, American flag baggy pants, red star-printed bandana, yellow shooting glasses, and black running shoes

Rex Kwon Do Costume Items — Napoleon Dynamite

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Rex Kwon Do Napoleon Dynamite Halloween Diedrich Bader
  • 1 Black Sport Polo ShirtClean black short-sleeve polo — Rex’s no-frills instructor top
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  • 2 USA Flag Baggy PantsStars-and-stripes red, white, and blue — the pants of freedom
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  • 3 Star-Printed BandanaRed with white stars — tied across the forehead, Rex Kwon Do style
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  • 4 Yellow Shooting GlassesTinted wraparound glasses — worn throughout the dojo sequence
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  • 5 Black Running ShoesAll-black athletic footwear — Rex’s practical dojo sneakers
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Rex Kwon Do Halloween costume styling reference from Napoleon Dynamite showing the black sport polo, American flag baggy pants, star bandana, yellow glasses, and black running shoes assembled as the full character look

How to Style the Rex Kwon Do Costume

Put on the black sport polo first — it goes on clean and plain, tucked or untucked depending on your preference, and serves as a deliberate neutral backdrop that makes the American flag pants hit as hard as possible the moment they go on. Step into the USA flag baggy pants and pull them up. These are the costume. The red, white, and blue stars-and-stripes pattern communicates Rex Kwon Do immediately to anyone who has seen Napoleon Dynamite and generates reactions from passersby who catch a glimpse from across the room. Wear them at a natural waistline — Rex is not a fashion character, he is a functional one.

Fold the red star bandana into a triangle and tie it around your forehead with the point forward or up. Rex’s bandana is tied across the forehead like a martial arts training headband — it is meant to signal discipline and authority, not style. Tie it firmly so it stays in place throughout the evening. Put on the yellow shooting glasses next — they sit on the face throughout the entire dojo sequence and are a key accessory detail that rewards people who know the film well. Lace up the black running shoes last.

Rex’s character is built entirely on conviction. He is not satirising confidence — he has it, fully and completely, about everything. The American flag pants are not a joke to him; they are intimidating athletic wear that carries the authority of freedom itself. The roundhouse kick is not a comedy bit; it is a legitimate threat he issues with genuine warning. Every line Rex delivers requires the same absolute sincerity — zero irony, zero hesitation, complete commitment to the premise that Rex Kwon Do is the most powerful martial art available in Preston, Idaho.

The Pants of Freedom

The American flag baggy pants are the entire costume. Everything else — the black polo, the bandana, the glasses, the shoes — supports the silhouette the pants establish. Once the pants are on, Rex is identifiable. Without them, the rest of the costume reads as a generic athletic instructor. Wear them with confidence, because Rex would wear them with nothing less. They are, as he himself would explain to you, the pants of freedom, Napoleon.

Bandana Positioning

Tie the star bandana across your forehead like a martial arts training headband rather than a pirate or outlaw bandana. Rex’s bandana sits flat across the brow and is tied at the back — it is meant to project discipline and focus, not flair. Fold the bandana into a straight band rather than a triangle point before tying it for the most accurate character-specific position. Check it in a mirror to ensure it sits level across the forehead.

The Roundhouse Kick Line

“Do you think anybody wants a roundhouse kick to the face while I’m wearing these bad boys? Forget about it.” This is the line that carries the entire evening. Deliver it with zero comedy intention and maximum personal conviction — Rex is not making a joke. He is offering a genuine warning about the intimidating effect of his freedom pants on any potential attacker. Gesture at your own pants as you deliver it. The sincerity is the character.

Yellow Glasses Positioning

The yellow shooting glasses can be worn directly on the face throughout the event or pushed up onto the bandana for moments when you want a clearer face shot. Both positions are character-adjacent — Rex is a practical man who wears his glasses where they need to be. For photos, wearing them on the face creates a stronger visual read of the full costume from a distance. For conversation, the pushed-up position keeps your face visible while the glasses remain a visible costume element.

Rex Kwon Do Philosophy

Rex has a complete worldview. Rex Kwon Do is not just a martial art — it is a lifestyle built on three pillars: respect, patriotism, and freedom. He teaches these principles alongside the physical techniques, and he delivers them with the gravity of someone who has thought about them deeply and concluded that he is correct about all of them. Channel this when people ask what Rex Kwon Do is: explain the three pillars. Briefly. With authority. No questions.

Martial Arts Stance

Rex spends his dojo sequence in a ready stance — feet shoulder-width apart, knees slightly bent, hands up at chest height in a loose guard position. Strike this pose whenever someone asks who you are or whenever the roundhouse kick line lands. The physical posture reinforces the character as strongly as any line of dialogue. Hold the pose with the specific quality Rex has: total calm, zero doubt, and the body language of someone who has thrown a roundhouse kick before and would absolutely do it again.

Rex Kwon Do Group & Couple Costume Ideas

Awkward Comedy Group

Rex, Michael Scott & Kenny Powers

A group of comedy’s most magnificently overconfident authority figures — Rex’s martial arts instructor certainty alongside Michael Scott’s regional manager delusion and Kenny Powers’ washed-up pitcher swagger. All three characters share the specific quality of being fully convinced of their own expertise in a field where their actual competence is significantly lower than their self-assessment. A group that rewards fans of 2000s comedy broadly and generates strong recognition from any audience familiar with The Office, Eastbound & Down, or Napoleon Dynamite.

Comedy Authority Figures

Rex, Ben Chang & Borat

Three of comedy’s most unhinged self-appointed experts — Rex Kwon Do’s martial arts instructor, Ben Chang’s utterly unqualified Spanish teacher from Community, and Borat’s Kazakh journalist operating on complete cultural misfires. All three characters claim authority in their respective domains with a conviction entirely disconnected from their actual qualifications, and all three generate immediate recognition from comedy fans who know their respective properties. A group built on the shared quality of spectacular confidence in spectacularly wrong expertise.

Gym Chaos Group

Rex, Nacho Libre & Rocky Balboa

Three of cinema’s most beloved athletic underdogs and improbable fighters — Rex Kwon Do’s patriotic dojo instructor alongside Nacho Libre’s luchador-wrestling monk and Rocky Balboa’s South Philly boxing heart. Three completely different athletic disciplines and three completely different aesthetic identities united by the shared quality of physical determination and training sequences that are more enthusiastic than technically perfect. A group that spans comedy and drama and generates broad recognition from fans across multiple eras of sports film.

Fighter Showdown Group

Rex, Young Bucks & Johnny Bravo

A physical showdown group built around characters defined by their absolute confidence in their own fighting ability and physical presence — Rex’s Rex Kwon Do patriotic stance alongside the Young Bucks’ tag team wrestling aesthetic and Johnny Bravo’s gym-mirror cartoon machismo. Three completely different visual identities united by the specific brand of physical self-confidence that each character embodies at maximum volume. A group concept that works across comedy, wrestling, and animation fandom simultaneously.

Rex Kwon Do cosplay group and couple costume ideas reference from Napoleon Dynamite showing the black polo, American flag pants, star bandana, yellow glasses, and black running shoes assembled as the full character look

DIY vs. Store-Bought Rex Kwon Do Costume

Build Strategy

The Rex Kwon Do costume is one of the most efficient comedy character builds available — five pieces anchored by the American flag pants and star bandana, which together do essentially all of the character recognition work. The black polo shirt is a deliberate neutral base that most people already own; check your wardrobe before purchasing. The yellow shooting glasses and black running shoes are low-cost completions. There is no meaningful DIY alternative for the American flag pants — character-accurate novelty flag pants are readily available and inexpensive, and they are what makes this Rex rather than a general patriotic character. Total build cost typically runs $40–$80, with the pants being the only significant purchase if you already own a black polo and black trainers.

  • USA flag pants = the defining costume purchase — not optional
  • Star bandana = low cost, high character recognition
  • Black polo = check wardrobe first before purchasing
  • Yellow glasses + black shoes = lowest cost completions in the build
  • Total: $40–$80 — one of the most affordable 2000s comedy builds available

Priority Piece Order

The American flag baggy pants are the first and most important purchase — they are what makes this costume Rex Kwon Do rather than a generic martial arts instructor or a patriotic costume. The star-printed bandana is the second priority, immediately reinforcing the character when paired with the pants. After those two, the yellow shooting glasses are the next most character-specific element — they appear in every shot of Rex in the dojo and are widely associated with the character’s look. The black sport polo and black running shoes are the lowest purchase priorities — both are common items that many people already own, making them the easiest and lowest-cost elements to complete. Check your wardrobe for both before ordering.

  • USA flag pants = first and most essential purchase
  • Star bandana = second priority, completes the patriotic double
  • Yellow shooting glasses = third priority, character-specific accessory
  • Black polo = check wardrobe first — most commonly already owned
  • Black running shoes = check wardrobe first — any all-black athletic shoe works

Rex Kwon Do Costume — Frequently Asked Questions

Rex wears a black short-sleeve sport polo shirt, red-white-and-blue American flag baggy pants, a red star-printed bandana tied across his forehead, yellow shooting glasses, and black running shoes. The American flag pants and star bandana are the two most recognisable elements of the look — together they immediately communicate Rex Kwon Do to anyone who has seen Napoleon Dynamite before a single word is spoken.

Rex is the self-declared martial arts instructor who operates Rex Kwon Do, a karate studio in Preston, Idaho, featured in Napoleon Dynamite (2004). He is played by Diedrich Bader and appears in the film’s memorable dojo sequence, where Napoleon and Pedro take his classes. Rex is defined by his extreme confidence, his patriotic American flag pants, his star bandana, and his absolute conviction that Rex Kwon Do is a genuine and devastating martial art system.

Rex is played by Diedrich Bader in Napoleon Dynamite (2004), directed by Jared Hess. His performance as Rex — confined to a single dojo sequence — became one of the film’s most beloved comedic set pieces. Diedrich Bader is a character actor with a wide range of comedy roles across film and television, and his portrayal of Rex generated some of the most quoted lines of the entire Napoleon Dynamite film.

“Do you think anybody wants a roundhouse kick to the face while I’m wearing these bad boys? Forget about it.” Deliver this with zero comedy intention — Rex is not joking. He is issuing a genuine warning about the intimidating power of his American flag pants. Gesture at the pants as you deliver it. His second most quoted line follows shortly: “These are the pants of freedom, Napoleon.” Both require total sincerity. That conviction is the character.

Yes — five pieces, with the American flag pants and star bandana doing essentially all of the character recognition work. If you have those two pieces on, you are Rex Kwon Do. The black polo, yellow glasses, and black running shoes complete the look at minimal additional cost. Total build cost typically runs $40–$80, making it one of the most affordable and most immediately readable 2000s comedy Halloween character builds available.

Napoleon Dynamite is the most natural in-film pairing — the awkward student to Rex’s overconfident instructor. For a broader comedy group, other characters defined by misplaced confidence in their own expertise work particularly well: Michael Scott from The Office, Kenny Powers from Eastbound & Down, Ben Chang from Community, and Borat all share Rex’s specific quality of being supremely certain about things they are profoundly wrong about.

Rex Kwon Do is the fictional martial arts school run by Rex in Napoleon Dynamite. Rex teaches a self-styled system of self-defence built on three pillars — respect, patriotism, and freedom — delivered with the gravity of someone who has thought about this carefully and concluded he is completely right. The Rex Kwon Do sequence in the film, in which Napoleon and Pedro attend classes, is one of Napoleon Dynamite’s most quoted scenes and the source of the character’s two most beloved lines.

Rex is a character from Napoleon Dynamite (2004), the independent comedy directed by Jared Hess and starring Jon Heder as Napoleon Dynamite. The film follows Napoleon, his brother Kip, Uncle Rico, and their friend Pedro through a series of deadpan misadventures in rural Idaho. Napoleon Dynamite became one of the defining cult comedy films of the 2000s, and Rex’s single-sequence appearance generated some of the film’s most quoted and most beloved moments.