Undergarments worn directly against the skin (e.g., undershirts, underwear, camisoles).
冬は重ね着のために薄手の肌着を数枚用意しておくと便利だ。
In winter, it's useful to have several thin undershirts ready for layering.
赤ちゃん用の肌着は肌触りのいい素材を選んでください。
Choose undershirts for babies made of materials that feel good on the skin.
彼は部屋着として肌着の上にパーカーを羽織っていた。
He was wearing a hoodie over his undershirt as loungewear.