Antonyms of adj in_one's_birthday_suit

1 sense of in one's birthday suit

Sense 1
mother-naked, naked as the day one was born, naked as the day you were born, in one's birthday suit, in your birthday suit -- (as naked as at birth)

INDIRECT (VIA unclothed) -> clothed, clad -- (wearing or provided with clothing; sometimes used in combination; "clothed and in his right mind"- Bible; "proud of her well-clothed family"; "nurses clad in white"; "white-clad nurses")

Similarity of adj in_one's_birthday_suit

1 sense of in one's birthday suit

Sense 1
mother-naked, naked as the day one was born, naked as the day you were born, in one's birthday suit, in your birthday suit -- (as naked as at birth)
       => unclothed (vs. clothed) -- (not wearing clothing)