Last updated: July 9, 2026·🔄 Guide reviewed and refreshed ahead of Halloween 2026.· By Ozan Bayraktar

Halloween Costume Guide

Flip From Slumberland Halloween Costume Guide

Half man, half goat, all outlaw, and somehow still the most reasonable adult in the movie.
Jason Momoa Netflix Fantasy Outlaw Beard
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Quick Answer: The Flip costume is a goat-horned outlaw look built around a long gothic jacket, with the horns and fangs doing the actual identifying work.
  • Goat Horns Headband (essential)
  • Small Deluxe Custom Fangs (essential)
  • Long Blazer Gothic Jacket
  • Long Brown Cosplay Wig
  • Purple Stylish Scarf

Flip smuggles Nemo through other people’s dreams while hunting for a pearl that can grant any wish, mostly because he owes her dead father a favor he never fully explains. The horns and fangs are what make this costume Flip instead of a guy in a cool jacket, since neither the jacket nor the accessories read as costume-specific on their own. Slumberland pulled in over a billion minutes streamed in its first week on Netflix (Wikipedia), so more people will place this one than a lot of the deep-cut characters on this site.

Items Total16 Items
DifficultyModerate
VibeHalf-Beast Outlaw
Cost$120-$280

Flip From Slumberland Halloween Costume Items

Flip from Slumberland Halloween costume infographic showing goat horns headband, fangs, gothic jacket, wig, scarf, necklaces, belt, boots, and pants

Flip Costume Items

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Flip Slumberland Jason Momoa Netflix
  • 1 Long Brown Cosplay WigGives Flip’s wild, unkempt hair without needing your own hair to cooperate. Go long and a little rough, not styled.
    See on Amazon
  • 2 Shoulder EpauletAdds a bit of formal, commanding shape to one shoulder of the jacket. Small detail, easy to skip if you are keeping the budget tight.
    See on Amazon
  • 3 Long Blazer Gothic JacketThis is the silhouette of the whole costume, so it needs to be long and dark, not a short fashion blazer. Everything else layers over or under it.
    See on Amazon
  • 4 Squared Crystal SunglassesAdds the eccentric, slightly untrustworthy edge to the look. Works pushed up on the head just as well as worn.
    See on Amazon
  • 5 Purple Stylish ScarfThe one unexpected color in an otherwise dark outfit. Wrap it loosely, it is meant to look grabbed rather than styled.
    See on Amazon
  • 6 Gold Black Pearl NecklaceCheck any costume jewelry box first, plain layered necklaces work fine.
    See on Amazon
  • 7 Pocket ChainA small detail that hangs from the jacket pocket. Easy to skip if you do not already own one.
    See on Amazon
  • 8 Black Pearl NecklaceLayers with the gold necklace. Skip if you only want one.
    See on Amazon
  • 9 Men’s Green T-ShirtCheck your closet first. Any plain, slightly worn green tee works underneath the jacket.
    See on Amazon
  • 10 Brown Leather BeltCheck your closet first, any wide brown leather belt works.
    See on Amazon
  • 11 Cerberus Belt BuckleA mythical touch that ties the outlaw look to the fantasy side of the character. Worth buying since it is doing real thematic work for a small item.
    See on Amazon
  • 12 Military Combat BootsCheck your closet first, any worn-in dark combat boot works.
    See on Amazon
  • 13 Small Deluxe Custom Fangs (essential)This is the other half of what makes the costume read as half-beast rather than just a guy in a long coat. Get a pair sized for your mouth so you can still talk clearly, since fangs that do not fit right just look like you are hiding candy in your cheek.
    See on Amazon
  • 14 Men’s Ultra Soft PantsCheck your closet first, any plain dark pants work under the long jacket.
    See on Amazon
  • 15 Goat Horns Headband (essential)This is the single most identifying piece of the whole costume. Get one with a backward, inward curve close to a real goat’s horns, and secure it to your wig so it does not slide backward over the night.
    See on Amazon
  • 16 Black Leather Fingerless GlovesCheck your closet first, plain fingerless gloves complete the outlaw hands without hiding your fingers.
    See on Amazon
Slumberland Flip cosplay costume with goat horns, fangs, and long gothic jacket

How to Style the Flip Halloween Costume

The horns are the first thing anyone clocks, since nothing else on this list reads as fantasy without them. Skip the fangs and the whole look drifts into a guy in a leather jacket with an odd choice of headband, instead of half-goat outlaw. At a dark party the sunglasses and scarf barely register, so the horns and fangs end up doing almost all of the identifying work by themselves.

Flip introduces himself to Nemo with a flourish, “Mad, bad, and dangerous to know. Named Flip,” then spends the rest of the movie living up to about half of that. He gets thrown into a dream prison by Agent Green for trespassing in other people’s heads and reacts less like a man in real trouble and more like someone mildly inconvenienced by paperwork. He also turns out to be the dream version of Nemo’s own uncle Philip, something he does not know and would probably hate finding out.

Fangs need to actually stay in

Cheap novelty fangs pop out mid-sentence, which kills the effect faster than not wearing them at all. Get a pair sized for your mouth and practice talking with them in before the party, not during it.

The horns headband shifts if you do not secure it

A flat elastic band under a wig slides backward over a few hours of talking and moving around. Bobby pin it to the wig underneath so it stays put instead of creeping toward the back of your head.

Flip From Slumberland Group Halloween Costume Ideas

Couples Idea

Flip & Nemo

Excellent pairing, and it is really the film’s poster image. Jason Momoa’s towering, horned outlaw next to a small girl in an oversized sweater reads as a duo even to someone who has never seen Slumberland, since the size and style contrast does all the work on its own. Anyone who has seen the movie will place it instantly.

Flip Nemo

Group Idea: The Slumberland Crew

Flip, Nemo & Uncle Philip

Might work, but the actual joke here, that Philip is Flip’s waking-world self, only lands with people who have seen the film. Without that context, it just looks like an outlaw, a girl, and a guy who sells doorknobs standing next to each other. Worth doing only if your group is willing to explain the twist.

Flip Nemo Uncle Philip
Flip from Slumberland Halloween costume styled with goat horns, gothic jacket, and fangs for a group costume

Flip From Slumberland Halloween Costume DIY Tips

Building the Look

Most of this closet-builds itself around two items worth buying specifically for accuracy.

  • Goat horns headband: buy this one, it is the item that actually identifies the character.
  • Fangs: buy a properly sized pair, do not improvise with novelty store ones that do not fit.
  • Jacket: thrift stores sometimes carry long dark coats, check before buying new.
  • Wig: optional if your own hair is already long and dark.
  • Necklaces, chain, scarf: dig through a costume jewelry box before buying anything.
  • Pants, boots, gloves, belt: check your closet first for all of these.
  • Cerberus buckle: small, cheap, and worth buying since it is the one accessory doing real thematic work.

Playing Flip at the Party

Flip talks like a man who has been getting away with things for a very long time, so play him confident, not menacing.

  • Introduce yourself the way he does: “Mad, bad, and dangerous to know.” Let people fill in the rest.
  • He is a professional thief, so the in-character bit at a party is casually eyeing other people’s stuff and commenting on it.
  • If someone doubts you can pull off a claim, “You wish you could dream up something this good,” works as a deflection.
  • Do not play him cruel. He is self-serving but not actually mean, and the character stops working if you go too dark with it.

Flip From Slumberland Halloween Costume: FAQ

The goat horns and the fangs are the two items that make this Flip instead of a guy in a leather jacket. Build the jacket, wig, and accessories around those two, and the rest of the outfit falls into place. Skip the horns and nobody is placing the character.

Reasonably. Slumberland pulled over a billion minutes streamed in its first week on Netflix, so more people have seen it than the reviews would suggest. Flip is the film’s most visually distinct character, which helps recognition even among people who only half remember the movie.

Two lines define him. His introduction: “Mad, bad, and dangerous to know. Named Flip.” And, after Nemo asks how the map led her from a dream into the real world: “The real world’s bigger than you thought.”

Jason Momoa. Slumberland premiered on Netflix on November 18, 2022.

Not really. He’s an outlaw who breaks dream law for personal gain, but he was Nemo’s father’s old partner and ends up genuinely protective of her. The film treats him as a rogue, not a threat.

Flip and Peter were partners in Slumberland long before the events of the film, sneaking through other people’s dreams together. Peter eventually went straight and settled down, which Flip never let him forget.

Keep both if you want to be recognized. The jacket and accessories are generic outlaw gear on their own. The horns and fangs are the only things that make the silhouette specifically half-beast, which is the whole point of the character.

Flip’s belt buckle is themed after which mythical creature?

Who imprisons Flip for trespassing in other people’s dreams?

Flip is the dream-world alter ego of which character?