noun
rompers; play suit
A one-piece garment for young children, combining a top and shorts, designed for active play. The term is somewhat dated; modern Japanese often uses ロンパース.
赤ちゃんに悪戯着を着せて公園へ行った。
I put rompers on the baby and went to the park.
この悪戯着は動きやすくて、子供が気に入っている。
These rompers are easy to move in, and my child likes them.
The modern loanword for rompers, more common in contemporary Japanese than 悪戯着.
Compound of 悪戯 (いたずら, 'mischief') and 着 (ぎ, 'clothing'), literally 'mischief wear', referring to a garment suitable for active, playful children. The exact origin is uncertain.