Birthdaysuit

6 clues
The altogether
State of undress
Invisible outfit?
Lady Godiva's "attire
What we all arrive in
What a skinny-dipper wears
Similar answers:
Americasbirthdaycake
Belatedbirthday
Birthday
Birthdaycake
Birthdaycakes
Birthdaycandles
Birthdaycards
Birthdaycod
Birthdaygifts
Birthdaykick
Birthdaynewyear
Birthdayparty
Birthdaypresent
Birthdaypreset
Birthdayreturns
Birthdays
Birthdaysuit
Birthdaytreat
Birthdaywish
Happybirthday