undershirt worn under a kimono; singlet
A thin, usually white, garment worn directly against the skin under a kimono. The word is a loan from Portuguese 'gibão'.
from Portuguese gibão
You wear a juban under a kimono.
夏は薄手の襦袢が涼しくて良い。
In summer, a thin juban is nice and cool.
undershirt worn under a nagajuban
nagajuban; under-kimono
Standard kanji spelling, though the characters are ateji (phonetic).
Kana spelling is common in everyday writing.
Katakana spelling is sometimes used for emphasis or in informal contexts.
Borrowed from Portuguese 'gibão' (a type of jacket or doublet), adapted into Japanese as 襦袢 (ateji). The exact historical derivation is uncertain, but the word has been used since the Edo period.