Definitions:

1. A short-sleeved casual top, generally made of cotton, having the shape of a T when spread out flat. NOUN
   • We wear shorts and T-shirts for games.
2. A type of shirt that covers the upper body, has short sleeves and no collar, and is pulled on over the head. NOUN
   • I was only wearing a T-shirt when the rain started.

Synonyms:

• jersey
• slipover
• sport shirt
• undershirt