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in (one's) birthday suit

Completely naked. (Alludes to the fact that one's "suit" is nothing at all when born.) I have a recurring nightmare where I'm walking through school in my birthday suit. As kids, we had no problem going swimming together in our birthday suits.
See also: birthday, suit

*in one's birthday suit

Fig. naked; nude. (In the "clothes" in which one was born. *Typically: be ~; get [into] ~.) I've heard that John sleeps in his birthday suit. We used to go down to the river and swim in our birthday suits.
See also: birthday, suit

birthday suit

Nakedness, as in The doorbell rang, and here I was in my birthday suit. In 18th-century Britain this term originally referred to the clothes one wore on the king's birthday. Later it was jocularly transferred to bare skin, alluding to the condition of a newborn baby.
See also: birthday, suit

in your birthday suit

If you are in your birthday suit, you are not wearing any clothes. I could go out there in my birthday suit and nobody would even notice. Note: This expression is used humorously.
See also: birthday, suit

in your birthday suit

naked. humorous
See also: birthday, suit

in/wearing your ˈbirthday suit

(informal, humorous) wearing no clothes; naked: The towel fell off, and there he was in his birthday suit!
See also: birthday, suit, wearing

birthday suit

Wearing no clothes. People said to be in their birthday suit are as naked as the day they were born.
See also: birthday, suit
References in periodicals archive ?
Table 29: World 14-Year Perspective for Birthday Greeting
Aishwarya wanted to surprise hubby by arranging the birthday party and she even told his friends not to discuss about the party with him.
Amitabh Bachchan with wife Jaya Bachchan, son-in-law Nikhil Nanda, daughter Shweta Nanda, son Abhishek Bachchan, and daughter-in-law Aishwarya Rai-Bachchan during a party on the eve of his 70th birthday in Mumbai
The Virtual Birthday Party dedicated website is an ideal gift that's easy to give: low cost, no hassle, and user-friendly -- an instant electronic party plus a “greetings” keepsake for the recipient.
I like to send and receive birthday cards with personal notes in them.
PLEASE say a very happy birthday to our special little boy, Charlie Clifford, who will be five on November 1.
The fading birthday sign outside the room lost its glow among announcements for skating lessons and the latest skate-shop bargains.
The decline in the abortion rate among teenagers whose pregnancy occurred 0-3 months after their 18th birthday and the decline among those who became pregnant 0-3 months before their birthday--and would therefore have been able to obtain an abortion by the end of their first trimester--did not differ significantly In contrast, the decline among teenagers who conceived 3-6 months before they became 18--and would have been able to attain an abortion only in their second trimester--was 16% greater.
It's been a wonderful birthday after all,'' he said.
Two-thirds of Welsh people think it is enough that people remember their birthday with over a third believing they are about bringing friends together.
Birthday celebrations on the Isle of Struay are always fun, but Katie's birthday is especially exciting to her.
Tomorrow is my father's birthday and then it's just a few days until it's many happy returns to Firstborn and my mother.
Here is a bit of history on birthday celebrations and traditions, supplied by The Pillsbury Company:
Here's a case in point: The approach of a birthday appears to prolong life for a short while among women and hasten death among men, assert sociologist David P.