noun
dress shirt; button-up shirt; business shirt
Refers to a formal, collared, button-front shirt typically worn with a suit or tie. Derived from English 'white shirt' but used for shirts of any color.
from English white shirt
明日の面接のために新しいワイシャツを買った。
I bought a new dress shirt for tomorrow's interview.
彼はいつも白いワイシャツを着ている。
He always wears a white button-up shirt.