dress coat

tail coat.

Origin of dress coat

First recorded in 1760–70

dress-coat·ed, adjective

Irish servant appears with her sleeves rolled up and her dress pinned in the form of a dress-coat behind.

The Art of Amusing |Frank Bellew
It was a dress-coat such as had been worn by Mr. Sylvester the evening before.

The Sword of Damocles |Anna Katharine Green
The man puts on that kind of talk just as he puts on his dress-coat; both are part of the evening uniform.

Punch, or the London Charivari, Vol. 102, April 30, 1892 |Various
He was dressed in the demi-toilet which answers for dinners in the West, on occasions where a dress-coat is not required.

The Cup of Trembling and Other Stories |Mary Hallock Foote

She was amazed both at the count's admiration, and at the transformation which Jean's dress-coat had made.

Bijou |Gyp

dress coat

a man's formal tailcoat with a cutaway skirt