shirtsleeves has definitions from the field of clothing
1
[ noun ] (clothing) not wearing a jacket

Examples

"in your shirtsleeves" means you are not wearing anything over your shirt "in hot weather they dined in their shirtsleeves"

Used in print

(Jay Williams, The Forger....)

I did book_jackets and covers for paperback reprints : naked girls huddling in corners of dingy furnished rooms while at the doorway , daring the cops to take him , is the guy in shirt_sleeves clutching a revolver .

Related terms

dishabille

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