ワイシャツ (waishatsu) means “dress shirt”

More examples

旅行には替えのワイシャツを持っていきます。ryo kō ni wa ka e no wa i sha tsu o mo tte i ki ma su

I take a spare dress shirt on trips.

Describes a neat shirt worn under a jacket or with formal trousers rather than as casual everyday clothing.

カッターシャツkattāshatsu: A regional Japanese term for a dress shirt worn with formal clothing.

襟があり、前面をボタンで留める、仕事や改まった場面で着るシャツ。eri ga a ri zen men o bo ta n de to me ru shi goto ya arata ma tta ba men de ki ru sha tsu

ワイシャツ (waishatsu) is borrowed from the English phrase "white shirt", with the pronunciation adapted to Japanese sound patterns.

ワイシャツ (waishatsu) can be modified by 半袖 (hansode, "short sleeves") or 長袖 (nagasode, "long sleeves"), so the word itself does not specify sleeve length.