Last updated: July 17, 2026ยท By Oggy

Halloween Costume Guide

Leila Kalomi Halloween Costume Guide

You never told me if you had another name, Mr. Spock?
Jill Ireland 60s Casual Sci-fi
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Quick Answer: The Leila Kalomi costume is a simple 1960s botanist look: overalls over a chiffon blouse, no accessories required.
  • Olive Overalls (essential)
  • Light Purple Chiffon Blouse Shirt (essential)
  • Blonde Wig
  • Black Boots

Leila Kalomi is a botanist who loved Spock years before the events of the episode, and never got anything back from him for it. The overalls and chiffon blouse are the whole costume, there’s no prop or symbol to build around. Leila Kalomi is played by Jill Ireland in the Star Trek: The Original Series episode “This Side of Paradise” (Wikipedia), which aired in 1967. She’s a one-episode character, so outside of longtime fans of the original series, almost nobody will place the name.

Items Total4 Items
DifficultyVery Easy
Vibe60s Botanist Casual
Cost$40-$110

Leila Kalomi Halloween Costume Items

Leila Kalomi Star Trek Halloween costume infographic showing olive overalls, purple chiffon blouse, blonde wig, and black boots

Leila Kalomi Costume Items

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Leila Kalomi Star Trek
  • 1Olive Overalls (essential)The base of the whole look. Loose fit, plain olive color, nothing tailored or fashion-cut. This is a working botanist’s outfit, not a statement piece.
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  • 2Light Purple Chiffon Blouse Shirt (essential)Worn under the overalls, collar visible. The soft color and fabric is the one detail that keeps this from reading as plain workwear.
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  • 3Blonde WigSkip it if your hair is already light. If not, a simple straight blonde wig matches Leila’s look without needing anything elaborate.
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  • 4Black BootsCheck your closet first, plain black boots work fine here.
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Leila Kalomi cosplay styling reference showing the overalls and chiffon blouse combination from Star Trek

How to Style the Leila Kalomi Halloween Costume

The overalls are the first thing people notice, and they need to sit loose, not tailored, or the whole look drifts toward a modern fashion outfit instead of a 1960s botanist on an away mission. The chiffon blouse underneath is doing a lot of quiet work here, without it the overalls alone read as generic farm-wear rather than anything specific. If you skip the blouse and the color contrast, the costume mostly disappears into “person in overalls.”

Leila spent years thinking about a man who barely registered her, and when a plant’s spores finally strip away his self-control, he tells her he loves her, and means it for exactly as long as the spores last. She doesn’t get an apology when it wears off. She just watches it happen again.

Wash the blouse before wearing it out

Chiffon shows sweat and deodorant marks fast under party lighting, especially in a light color like this. Wash it once before the event so the fabric sits right and doesn’t look stiff out of the packaging.

The wig only matters if your hair doesn’t already match

A cheap synthetic wig can look obviously fake in photos, especially under flash. If your own hair is close to blonde already, skip the wig entirely rather than fight with one that doesn’t sit right.

Leila Kalomi Group Halloween Costume Ideas

Duo Idea

Leila Kalomi & Spock

Strong pairing for fans of the original series, their entire dynamic in the episode is one-sided until the spores force Spock to feel something, and putting the two side by side tells that story without a word of explanation to anyone who knows it.

Leila Kalomi Spock

Group Idea: Original Enterprise Crew

Leila Kalomi, Spock & Captain Kirk

Might work, but Leila is a one-episode guest character next to two of the most recognized figures in the entire franchise, and the size mismatch is real. This group only lands with a crowd that already knows “This Side of Paradise” specifically.

Leila Kalomi Spock Captain Kirk

Group Idea: 1960s Sci-Fi Characters

Leila Kalomi & Other Classic Sci-Fi Women

Might work, but Leila’s outfit alone doesn’t carry any sci-fi signal on its own, it just reads as a period costume. This works better as a themed group where each person can name their character out loud than as a visual set that speaks for itself.

Leila Kalomi Classic Sci-Fi Woman
Leila Kalomi group Halloween costume reference from Star Trek: The Original Series

Leila Kalomi Halloween Costume DIY Tips

Building the Look

This is about as thrift-friendly as costumes get. Nothing here needs to be bought new.

  • Overalls: thrift stores almost always have plain olive or khaki pairs.
  • Chiffon blouse: any light purple or lavender blouse works, doesn’t need to be exact.
  • Wig: only buy one if your hair doesn’t already match. Otherwise skip it.
  • Boots: check your closet first.

Playing Leila Kalomi at the Party

Leila is gentle, a little wistful, and holding onto feelings that never quite land.

  • When someone asks who you are: “I’m a botanist. I used to know a Vulcan.” Said quietly, not a joke.
  • If someone asks about your love life: “It’s complicated. He’s very logical about it.”
  • Skip trying to explain the spore plot to strangers. It doesn’t land as a party anecdote.

Leila Kalomi Halloween Costume: FAQ

Wear the olive overalls over the light purple chiffon blouse, add a blonde wig if your hair isn’t already blonde, and finish with black boots. It’s a simple, practical late-1960s look, nothing about it needs to be exact to read as her.

Niche. Leila appears in a single 1967 episode of the original Star Trek series, and outside of longtime fans of the show, almost no one will place the name or the outfit. The look works fine as a generic 60s sci-fi costume, but don’t expect recognition at a general party.

Her most quoted exchange is with Spock: she asks, “You never told me if you had another name, Mr. Spock?” and he replies, “You couldn’t pronounce it.”

Leila Kalomi is played by Jill Ireland in the episode “This Side of Paradise,” which first aired in 1967.

Leila met Spock on Earth years earlier and loved him, but he never returned the feeling. On the colony, spores from a native plant knock down Spock’s emotional control, and he tells her he loves her and stays behind when the Enterprise is ordered to evacuate. When the spores wear off, so does the feeling, and Leila is left facing that alone.

What is Leila Kalomi’s profession in Star Trek?

Who plays Leila Kalomi in “This Side of Paradise”?