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в чем мать родила stresses
gen.	in nature's own
в чём мать родила
gen.	in one's pelt (VLZ_58); in the starkers (Anglophile); in buff; au naturel; birthday suit; mother-naked; starkers; stark-naked; in one's birthday suit; starko (Anglophile); mother naked; stark naked; in one's skin; as naked as my mother bore me; bare as an egg (Wakeful dormouse)
Gruzovik	not to have a stitch on
amer.	buck-naked (Anglophile)
Gruzovik, humor.	in one's birthday suit; stark-naked
idiom.	in the altogether (Anglophile); naked as the day one was born (Lana Falcon); in one's birthday attire (This nudity was not new to the underground press of the ’60s but it was the first time actual celebrities appeared in birthday attire on the cover of a national publication rssing.com Alexander Oshis)
idiom., inf.	in the buff (nude: In the summer of 2009, he famously was snapped riding a horse while in the buff. • The streaker ran across the playing field in the buff.)
inf.	in the nuddy (Anglophile); butt naked (Andrey Truhachev)
Makarov.	in one's bare skin; in a state of nature
proverb	be in one's birthday suit; be in one's birthday suit (дословно: Быть в костюме, в котором родился); in one's bare skin; in one's birthday suit; not to have a stitch on
slang	birthday suit; in the raw; starkers (обычно in the starkers)

в чём мать родила: 12 phrases in 3 subjects

General	3
Humorous / Jocular	7
Proverb	2