IPA: /ˈoʊvərʃɜrt/
KK: /ˈoʊvərˌʃɜrt/
A type of shirt that is worn on top of another shirt or clothing, typically not tucked in.
He wore an overshirt over his t-shirt for extra warmth.
Overshirt → It is formed from "over-" (meaning above or on top of) and "shirt" (from Old English "scyrte", meaning a garment worn on the upper body). The word "overshirt" refers to a shirt that is worn over another shirt or garment.
Think of wearing a shirt 'on top' ('over-') of another garment — that's what an overshirt is.
No commonly confused words.