shirt-sleeve

American  

[shurt-sleev] / ˈʃɜrtˌsliv /

Or shirtsleeve,

adjective

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.

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Etymology

Origin of shirt-sleeve

First recorded in 1560–70

Example Sentences

“Inside these great bubbles of air the explorers, or colonists, would live in a shirt-sleeve environment; only when they went outside would they have to wear pressure suits or travel in closed vehicles.”

From Slate

In a surprising gesture, the bespectacled monarch was seen seated in a chair, coat off, suspenders showing, and shirt-sleeve rolled up, with his arm at the ready to donate blood.

From Washington Times

The afternoon’s high, which enabled relaxed shirt-sleeve strolling, was reached after a 27-degree climb from the morning low of 49.

From Washington Post

As he spoke, he was dipping into his bag and producing the instruments for transfusion; I had taken off my coat and rolled up my shirt-sleeve.

From Literature

As he spoke he took off his coat and rolled up his shirt-sleeve.

From Literature