[Experiment] Kigurumi Testing — Output Differences Between kigurumi / animal onesie / bear kigurumi / cat kigurumi, and Underdressed Expressions

Conclusions First

• kigurumi alone does not produce an animal kigurumi pajama. All 3 out of 3 output fleece loungewear or Japanese clothing like samue
• animal onesie is the correct word for “kigurumi pajama.” A hooded, full-body animal-face fleece onesie outputs stably in all 3 out of 3
• bear kigurumi and cat kigurumi can specify the animal type. While kigurumi alone pulls toward Japanese clothing, prefixing an animal name causes correct kigurumi pajama interpretation
• wearing only a kigurumi, nothing underneath fails. The kigurumi being interpreted as Japanese clothing recurs, with 2 out of 3 outputting yukata and 1 outputting a completely bare subject
• wearing only an animal onesie succeeds as kigurumi but shows no “bare skin feel.” All 3 out of 3 are the fully-worn kigurumi pajama; the effect of wearing only was not confirmed
• unzipped animal onesie, cleavage is the correct approach for an open/undone expression. All 3 out of 3 reproduce the state of the zipper down with the chest visible
• animal onesie, nude underneath also functions as an open expression. All 3 out of 3 show the front slightly open, but less clearly exposed than unzipped

What This Article Covers

• Whether kigurumi produces the intended kigurumi pajama
• Output differences with animal onesie
• Precision of depicting different animals when specified (bear / cat)
• How “wearing kigurumi directly on skin” affects the output
• Comparison of open expressions using wearing only, unzipped, and nude underneath

Experiment Design

Base Prompt

Living room, standing pose fixed; only the costume keyword is swapped.

Condition List

Results for Each Condition

A: kigurumi

seed 42	seed 123	seed 789

Observation:

• None of the 3 output an animal kigurumi pajama
• seed 42: Light blue button-front fleece jacket and pants set. Loungewear/pajama feel
• seed 123: Navy short Japanese garment with a red sash and knee-high socks. Mini Japanese-style outfit
• seed 789: Gray samue-style setup. Navy collar and hem accents
• What’s common across 3 images is a “Japanese indoor/traditional clothing” interpretation. No hood or animal ears in any

Note: In English-speaking contexts, kigurumi sometimes refers to cosplay masks or full-body suits, which may explain why it doesn’t connect to animal kigurumi pajamas here (speculative).

B: animal onesie

seed 42	seed 123	seed 789

Observation:

• All 3 out of 3 are hooded full-body onesie pajamas with animal motifs — the classic “kigurumi pajama”
• seed 42: Gray and white two-tone. Animal face on hood (dog or husky-style). Front zipper opening
• seed 123: Similar gray scheme. Animal face on hood is slightly different but overall structure matches
• seed 789: Pink-beige and white two-tone. Animal face on hood. Bare feet visible
• All 3 express a fluffy fleece material texture
• Animal type not specified, so an ambiguous animal face (dog/cat-like) appears on the hood

C: bear kigurumi

seed 42	seed 123	seed 789

Observation:

• All 3 out of 3 output a bear kigurumi pajama
• While kigurumi alone pulled toward Japanese clothing, prefixing bear causes correct kigurumi pajama interpretation
• seed 42: Beige bear. Round ear hood, button-front opening
• seed 123: Brown bear. Round ear hood, zipper-front opening. Face features are clear
• seed 789: Slightly darker brown bear. Bear face parts on hood are clear
• All 3 consistently show round ears — the bear characteristic
• Color range varies from beige to brown, but all are natural bear colors

D: cat kigurumi

seed 42	seed 123	seed 789

Observation:

• All 3 out of 3 output a cat kigurumi pajama
• seed 42: Light blue fleece. Pointed triangular ear hood with pink inner ears. Hands clasped at chest pose
• seed 123: Gray fleece. Pointed triangular ear hood with pink inner ears
• seed 789: Beige fleece. Pointed triangular ear hood
• All 3 consistently show pointed triangular ears — the cat characteristic
• The contrast with Condition C’s bear (round ears) is clear and distinct

E: wearing only a kigurumi, nothing underneath

seed 42	seed 123	seed 789
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Observation:

• None of the 3 achieved the intended “wearing kigurumi pajama directly on bare skin” result
• seed 42: Blue-white striped yukata with red sash. Same Japanese clothing interpretation as Condition A
• seed 123: Navy patterned yukata with sash. Also Japanese clothing
• seed 789: The kigurumi completely disappears and the subject stands fully nude. nothing underneath acted to remove the clothing
• The Japanese clothing interpretation from kigurumi alone recurs, further worsened by nothing underneath

F: wearing only an animal onesie

seed 42	seed 123	seed 789

Observation:

• All 3 out of 3 are leopard-print animal hooded full-body onesie pajamas. Success as kigurumi
• seed 42: Yellow base with black leopard spots. Animal ears and face on hood. Zipper closed to neck — no bare skin visible
• seed 123: Same leopard print. Round ears on hood. Zipper fully closed
• seed 789: Leopard print. Animal face parts on hood. Zipper also closed
• All 3 output normal wearing state despite the wearing only specification — no visual difference from standard wearing
• No effect of adding wearing only compared to Condition B’s animal onesie
• Animal type is consistently leopard/cheetah-style across all 3 (Condition B had dog/cat)

G: unzipped animal onesie, cleavage

seed 42	seed 123	seed 789

Observation:

• All 3 out of 3 show a gray hooded animal onesie pajama with the front zipper down and the chest open
• seed 42: Gray and white two-tone. Zipper down to chest level, cleavage visible. No underwear visible
• seed 123: Gray onesie. Zipper down with cleavage visible. Slight underwear-like element barely visible
• seed 789: Gray and white two-tone. Chest open with cleavage visible. No underwear visible
• All 3 have cat or dog-style animal hood with pink ears
• The combination of unzipped and cleavage stably succeeds in showing cleavage while wearing the kigurumi
• No negative effect on the kigurumi itself. Same quality kigurumi pajama as Condition B

H: animal onesie, nude underneath

seed 42	seed 123	seed 789

Observation:

• All 3 out of 3 show animal hooded full-body onesie pajamas. Success as kigurumi
• seed 42: Beige fleece. Animal ears and face on hood. Front slightly open with bare skin visible at the chest. Decorative buttons
• seed 123: Beige fleece. Animal ears on hood. Front slightly open with a little bare skin at the chest
• seed 789: Beige fleece. Animal ears on hood. Front slightly open but exposure is modest
• Unlike Condition E where nothing underneath caused the costume to disappear, animal onesie as a base in Condition H keeps the kigurumi stable
• nude underneath may have slightly influenced how open the front is, but the open effect is not as clear as Condition G’s unzipped, cleavage
• No actual nudity exposure in any of the 3

Side-by-Side Comparison at Same Seed

All conditions at seed 42.

A: kigurumi	B: animal onesie	C: bear kigurumi	D: cat kigurumi
Fleece loungewear	Animal hooded onesie	Bear hooded onesie	Cat hooded onesie

E: only kigurumi	F: only animal onesie	G: unzipped onesie	H: nude underneath
Yukata	Leopard onesie	Open onesie	Slightly open onesie

All conditions at seed 123.

A: kigurumi	B: animal onesie	C: bear kigurumi	D: cat kigurumi
Mini Japanese garment	Animal hooded onesie	Bear hooded onesie	Cat hooded onesie

E: only kigurumi	F: only animal onesie	G: unzipped onesie	H: nude underneath
Yukata	Leopard onesie	Open onesie	Slightly open onesie

Summary

Practical Tips

• Use animal onesie to get a kigurumi pajama. kigurumi has a high risk of pulling toward Japanese clothing
• {animal} kigurumi format is effective for specifying the animal type. Both bear kigurumi and cat kigurumi succeeded 3/3. The animal name appears to lock kigurumi’s meaning toward the animal pajama side
• unzipped animal onesie, cleavage is the most effective for an open/undone expression. Reproduced the zipper-down chest exposure in all 3 out of 3
• wearing only doesn’t work for kigurumi open expressions. Combined with animal onesie the kigurumi appears, but there’s no visual difference from normal wearing
• nude underneath doesn’t go out of control when combined with animal onesie. While kigurumi + nothing underneath in Condition E caused the costume to disappear, using animal onesie as a base maintains the kigurumi. However, the openness is inferior to unzipped
• Expressions like nothing underneath that suggest nudity risk costume disappearance when combined with kigurumi. The risk is reduced by using animal onesie as a base
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