Instead of choosing the most modest and humble of suits—a sack suit, perhaps—they opt for something more regal.
A man in an American sack suit, with a bowler hat on his head, lounges against this rail.
Men are tapped on the shoulder by a civil gentleman in a sack suit, and walk away with him, never to be seen again.
The dinner coat has no tails and is cut like a sack suit except that it is held closed in front by one button at the waist line.
Her attendants could wear the simplest sort of morning dresses with garden hats; the groom a sack suit or flannels.
I'd be lost in a place like that—me in a sack suit and round-top dicer!
He decided at the last moment to wear his usual town-going suit, a sack suit of black, made by a Bonneville tailor.