romper

[ rom-per ]

/ ˈrɒm pər /

a person or thing that romps.

Usually rompers. (used with a plural verb)

a loose, one-piece garment combining a shirt or blouse and short, bloomerlike pants, worn by young children.
a similar garment worn by women and girls for sports, leisure activity, etc.

Origin of romper

First recorded in 1835–40; romp + -er¹

If this has something to do with gunrunning,” he mused, “it would make Iran-contra look like the Romper Room.

Conspiracy Theories Haunt Benghazi Anniversary |Jamelle Bouie |September 11, 2013 |DAILY BEAST
And one must not forget to declare the fundamental fact of his entire position in Romper.

The Monster and Other Stories |Stephen Crane
His romper trousers were spread wide on each side and he strutted consumedly.

Ethel Morton at Chautauqua |Mabell S. C. Smith
These facts seemed to strike Scully as fascinating, and afterwards he volunteered that he had lived at Romper for fourteen years.

The Monster and Other Stories |Stephen Crane

When a romper was finished it had to be tried on that very minute.

Leerie |Ruth Sawyer
Then Marni would run and get her romper and bring it to mother calling, “Romper, romper.”

Here and Now Story Book |Lucy Sprague Mitchell