a collarless pullover shirt, typically made of cotton or a knit fabric, with a round neckline and a short buttoning placket, usually 2–5 buttons ,in the front
例
He paired his jeans with a grey Henley shirt.
彼はジーンズにグレーのヘンリーシャツを合わせた。
Henley shirts are great for layering in cooler weather.