a surname

a polo shirt

a T-shirt

a dress shirt / a long-sleeved button-down shirt

an aloha shirt

sleeveless undershirt, singlet, vest, tank top

(politics, historical, archaic) the head of the 太政官 (Ōimatsurigoto no Tsukasa, “Great Council of State”, the highest government office under the 律令 (Ritsuryō) system), equivalent to a “grand minister” or “chancellor of the realm”

Short for フランネルシャツ (furanneru shatsu, “flannel shirt”).

(informal) boyfriend's shirt

Alternative spelling of ワイシャツ (“button-down shirt”)