noun
dress; one-piece dress
Casual abbreviation of ワンピース, used especially in fashion and everyday conversation.
See also: ワンピース
今日は花柄のワンピを着ている。
I'm wearing a floral dress today.
夏はワンピ一枚で過ごせるから楽だ。
In summer, you can get by with just a dress, so it's easy.