衣装
いしょう · ishou · JLPT N1 · noun
outfit
👗 衣 (clothing) + 装 (dress up) = 衣装: the clothing you dress up in, a full outfit or costume
Both parts concern wearing: 衣 means clothing, and 装 means dressing or equipping. Together they name a complete outfit, including stage costumes and fancy dress.
装 — clothes 衣 + strong 壮 (phonetic)
装 is a semantic-phonetic compound. The bottom 衣 ('clothes') gives the meaning, since the original sense was packing or dressing—putting clothes or goods into a bundle. The top 壮 supplies the sound. Meanings extended from 'to dress/attire' to 'to load, install, pretend'.