fuku

Etymology
From

Noun

 * 1) A Japanese-style school uniform, especially a sailor fuku.
 * 2) * Mankichi attends a middle school in a small village, which has gakuran for guys and fukus for girls. - https://official-tropes.fandom.com/wiki/Sailor_Fuku
 * 3) A costume, as of an anime character.
 * 4) * The moisture wicking is excellent, which is great for wearing fuku to hot Texas summer cons. - https://thegeekyseamstress.com/2019/06/14/costume-notes-sailor-pluto-3-0/
 * 5) * Oh the joys of wearing fuku in public. - https://cosplay.com/index.php/s/3n65bmjw9

Etymology
Perhaps from or maybe of ideophonic origin

Noun

 * 1)  lungs, any soft internal organ like the lungs, spleen; especially the one of an animal