dressed up in fine clothes; in one's best clothes
Describes a person's appearance when wearing formal or celebratory attire, often for special occasions.
At the wedding, she looked very beautiful in her formal attire.
Everyone gathered in their best clothes for the Coming of Age ceremony.
More general term for formal dress; 晴れ着姿 specifically evokes festive or celebratory attire.
Compound of 晴れ着 (formal clothes) and 姿 (appearance, figure).