What Does “Koszulka” Mean in Polish? The word “koszulka” in Polish has several meanings, depending on context. It’s most often used to describe clothing, but it can also refer to sportswear or office supplies. 1. Clothing Primarily, koszulka means a light shirt, such as a T-shirt, tank top, or undershirt. Example: Lubię nosić bawełnianą koszulkę. (I like wearing a cotton T-shirt.) 2. Sports In sports, koszulka refers to a jersey or team shirt. Example: Zawodnik ma koszulkę z numerem 10. (The player is wearing a jersey with number 10.) 3. Office Use It can also mean a plastic document sleeve, used to protect papers. Example: Włóż dokument do koszulki. (Put the document into a sleeve.) Summary Koszulka is a flexible word in Polish, used for shirts, sports jerseys, and even office supplies.