When a character is not wearing multiple outer garments that who normally wears, and exposing the inner clothing that is not normally exposed (or partially exposed), but it is not [[underwear only]].
If the character is simply not wearing one of the outer garments (like [[jacket]], [[cape]], etc), please mainly use no_xx ([[no jacket]], [[no cape]], etc), unless the outer garment usually covers a large area of the inner clothing.
アンダースーツ インナースーツ インナー ピッチリアンダー ギアインナー