He looked around and saw a man in a dark lounge suit with a briefcase who had just arrived in a car.
We have gradually seen the lounge suit become accepted business attire throughout the world.
One can understand the child's disappointment at meeting someone dressed in an ordinary lounge suit.
I suppose that it may be impertinent for a mere commoner, dressed in a shabby lounge suit, to tell peers of the realm what to do.
This article discusses the history of the lounge suit, often called a business suit when made in dark colours and of conservative cut.
However, the lounge suit was not considered appropriate for public settings until the 1870s.
Since the 1950s it has been used as a black version of the lounge suit as an informal look to the dinner jacket.
For example, black tie (originally "dinner clothes") was initially described as informal, while the lounge suit, now standard business attire, was originally considered (as its name suggests) casual wear.
