A light typically collarless shirt or top made to be worn underneath other clothing, such as [[dress shirt]]s.  They're frequently plain and white. 

Men may wear "wifebeater" [[tank top]]-style sleeveless undershirts, especially to accentuate a blue-collar look.

When made for females, there may be some overlap with [[camisole]].  They may be worn in lieu of a [[bra]] by (typically younger) flat-chested girls with no need for supporting their breasts.

In terms of [[sportswear]], the term "undershirt" usually refers to a [[taut shirt]] worn under most clothing (a baseball uniform, for example).

This tag should [b]not[/b] be used for dress shirts.

h4. See also

* [[Shirt under coat]]
* [[Shirt under dress]]
* [[Shirt under jacket]]
* [[Shirt under shirt]]
* [[Shirt under sweater]]