This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Plural form of panty.

n. Short underpants for women and girls.

"Soon everyone's in panties, the men, too, 13 dancers rolling on top of one another until they come to rest in a pileup of jumbled legs and backs."

get one's panties in a bunch   

undies    underpants    pants    knickers   

antes    shanties    vigilantes   

underwear    bra    nightgown    blouse    camisole    Bikini    lingerie    negligee    Jeans    sweatshirt