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Wiktionary
romper suit

n. a one-piece garment for an infant or small child; a onesie

WordNet
romper suit

n. a one-piece garment for children to wear at play; the lower part is shaped like bloomers [syn: romper, rompers]

Wikipedia
Romper suit

A romper suit, or just romper, is a one-piece combination of shorts and a shirt worn both by children and adult women.