adjective
also shirt-sleeves or shirt-sleeved ˈ ̷ ̷| ̷ ̷
1.
a. : being without a coat
spoke before a shirt-sleeve audience standing in the sun
b. : calling for the removal of coats for the sake of comfort or efficiency
still does shirt-sleeve work in the laboratories and hangars — Sidney Shalett
last week was quite up to par, shirt-sleeve weather included — G.F.T.Ryall
2.
a. : marked by informality and directness
was shirt-sleeve diplomacy, a bit rough, but it got results — V.L.Albjerg
a shirt-sleeves biography alive with informality and fun — Lee Rogow
b. : marked by closeness of contact with actual facts as opposed to theory
strive at higher mathematical formulas for linguistic meaning while knowing nothing correctly of the shirt-sleeve rudiments of language — B.L.Whorf