Date: circa 1784 intransitive verb to dress in overly or inappropriately simple or informal clothing, transitive verb to dress (as oneself) more simply or informally than is appropriate
UNDERDRESS
Meaning of UNDERDRESS in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012