1An undershirt worn directly against the skin, such as a tank top or thin base layer worn beneath other clothes.
冬は服の下にシャツを一枚着ると暖かい。
In winter, wearing an undershirt under your clothes keeps you warm.
運動する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 when exercising.
汗をたくさんかいたので、シャツを取り替えた。
I sweated a lot, so I changed my undershirt.
2A shirt worn as outerwear, typically with a collar and buttons (e.g., a dress shirt), though the term also covers casual types like T-shirts.
新しい白いシャツを買った。襟の形がとても気に入っている。
I bought a new white shirt. I really like the shape of the collar.
面接には襟付きのシャツを着ていくつもりだ。
I'm planning to wear a collared shirt to the interview.
シャツのボタンが取れていたので、縫い直した。
A button had come off my shirt, so I sewed it back on.
夏はシャツの袖をまくって着る人が多い。
In summer, many people roll up their shirt sleeves.