An undershirt (garment worn under other clothes), such as a vest or undershirt worn next to the skin.
寒い日はその下にもう一枚シャツを着たほうがいい。
On cold days, it's better to wear one more undershirt beneath it.
スポーツのときは吸汗性のいいシャツを着ると快適だ。
It's comfortable to wear a sweat-absorbing undershirt during sports.
汗をかいたのでシャツを取り替えた。
I changed my undershirt because I was sweating.
A shirt as outerwear (often with a collar and buttons), such as a dress shirt or blouse.
新しい白いシャツを買った。襟がきれいだ。
I bought a new white shirt. The collar is neat.
ワイシャツはアイロンをかけると見栄えが良くなる。
A dress shirt looks better after ironing.
シャツのボタンが外れているので縫い直した。
A button on the shirt came off, so I sewed it back on.