Dressing up in formal or splendid clothes; to be dressed up. Often used as 盛装する (to dress up).
結婚式には盛装して出席してください。
Please attend the wedding in formal attire.
舞踏会では男性はタキシード、女性は盛装で来るのが一般的だ。
At a ball it's common for men to wear tuxedos and for women to come dressed up.
彼女は特別な夜に盛装して現れた。
She appeared dressed up for the special evening.