the.com/birthday suit

The one outfit you owned before you owned anything, and it still fits.

means Naked — wearing nothing at all, the way you arrived into the world.

from A simple, charming 18th-century coinage: your 'birthday suit' is the body you were born in, since birth is the one day everyone is guaranteed to be wearing absolutely nothing. First recorded use in English dates to the 1730s, and it's stuck around precisely because the joke never gets old.

origin
first recorded in english around 1730s
logic
you wore it the day you were born
fashion status
zero accessories, zero dress code
universal size
one per customer, no returns
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