underdressed
🇺🇸
/ˌʌndərˈdrest/
🇬🇧
/ˌʌndəˈdrest/
wearing clothes that are too casual for a particular event or place
You seem underdressed for the black-tie event.
당신은 블랙타이 행사에 비해 복장이 부족해 보입니다.