Pantaleo

Japanese: pantaletes

…In a broad sense, it is a general term for clothing worn under outerwear, but more commonly it refers to clothing worn directly against the skin. It is used for hygiene, warmth, body correction, decoration, etc. Western-style underwear is divided into three types according to its purpose: undergarments, foundations, and lingerie. All of them are made of cotton, linen, silk, wool, or synthetic fibers, and are white, flesh-colored, or the same color as the clothing worn on top. …

From [Pants]

...used for horse riding, cycling, coachmen, and court ceremonies. pantaletes: white linen or cotton underpants worn by women and children in the 19th century, visible from under their skirts. The hem was decorated with lace or pleated.

*Some of the terminology that mentions "pantaletes" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…広義には上着の下に着る衣類の総称であるが，一般には肌に直接つける衣類をいうことが多い。衛生，保温，体型の補整，装飾などのために用いられる。洋装の下着は用途によって肌着(アンダーウェアunderwear)，基礎下着(ファウンデーションfoundation)，装飾下着(ランジェリーlingerie)の3種に分けられる。いずれも木綿，麻，絹，羊毛，化学繊維などでつくられ，白，肌色，あるいは上に着る衣服と同色のものが用いられる。…