/sherrt"sleev'/ , adj.
1. not wearing a jacket; informally dressed: a shirt-sleeve mob.
2. warm enough to live or work in without wearing a jacket or coat: shirt-sleeve weather in November.
3. simple, plain, and informal; direct and straightforward in approach, manner, etc.: shirt-sleeve diplomacy.
Also, shirtsleeve, shirt-sleeved, shirt-sleeves .
[ 1560-70 ]