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Oh Kigurumis! That's the first time I hear that term. Its the "scientific" term for onesie if I understand.

Onesie is also correct! Kigurumi is the Japanese term "to wear a stuffed animal." Since Hawaii has a strong influence from Japan, these onesies are very popular down here.

https://kigurumi-shop.com/what-is-kigurumi.aspx

Completely acceptable attire for a party, clubbing, or concert :D They are also very adorable <3