shirt-sleeve

or shirt·sleeve, shirt-sleeved, shirt-sleeves

[ shurt-sleev ]
/ ˈʃɜrtˌsliv /

adjective

not wearing a jacket; informally dressed: a shirt-sleeve mob.
warm enough to live or work in without wearing a jacket or coat: shirt-sleeve weather in November.
simple, plain, and informal; direct and straightforward in approach, manner, etc.: shirt-sleeve diplomacy.

Origin of shirt-sleeve

First recorded in 1560–70
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for shirt-sleeve