slack suit

1. 1.

   casual dress consisting of slacks and matching jacket

   Broadersuit

   Narrowerpants suit

Questions about slack suit

What does slack suit mean?

slack suit means "casual dress consisting of slacks and matching jacket".

Is slack suit a common word?

slack suit is banded "Rare" — specialist or archaic — most readers will not have met it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.