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in (one's) birthday suit

Completely naked. Alludes to the fact that one is born without clothing. 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

wearing (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 wearing my birthday suit. As kids, we had no problem going swimming together wearing nothing but our birthday suits.
See also: birthday, suit, wearing

*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 ?
Singing "Happy Birthday to You" is a long-standing tradition.
However, the biological mechanisms by which birthdays or other symbolic anniversaries prolong or shorten life remain unknown, Phillips adds.
The North has rarely mentioned the leader's birthday, including in a report of the KCNA in January of 2014 when former NBA star Dennis Rodman visited Pyongyang with a team of former NBA players in a goodwill game with a North Korean selection of players for Kim's birthday.
When asked what Abhishek gifted her on the 40th birthday, she said "I think we will leave to Abhishek to share.
Birthday memories of my dear dad, thinking of you today on your birthday and every day after, all our love your broken hearted daughter Eileen, Dave and granddaughter Jade.
Birthday Gorilla is an incredibly cost effective way of marketing and communicating with your clients and is significantly cheaper than traditional direct marketing methods.
He got another one Saturday from Councilwoman Wendy Greuel, wishing him a happy birthday.
Heading up the first year's Tucson Birthday Celebration festivities are Cele Peterson, celebrating her own 75th anniversary in business in Tucson, and Michael Duran, vice president and chief development officer, Tucson Medical Center.
As I opened my eyes this morning I looked to Heaven above, I whispered Happy birthday Martinand sent you all my love.
Birthday memories of my darling wife, Vera, also my sister Edith.
PARTY, PART II: Happy birthday to Jessica Simpson, who turns 25 on July 10.
Then, in February, at the American International Toy Fair in New York City, Warren Brown, host of the Food Network show Sugar Rush, "baked" a larger-than-life celebratory birthday cake, with more than 40 pounds of PLAY-DOH compound as the main ingredient.
Thinking of you on your Birthday Ed, still loved, missed and remembered but never forgotten.
Joaquin Collin Johnson celebrated his first birthday Sunday even though he is really 4 years old.
Brown-Forman Corporation (NYSE: BFB) struck gold at the recent 2006 San Francisco World Spirits Competition, garnering a total of 11 medals, including four Gold Medals and a prestigious Double Gold medal for Old Forester Birthday Bourbon.