Not wearing any knickers; without knickers.(adjective)
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Use "knickerless" in a sentence
"Sixty-five years on, and Britain's most feted fashion designer is many things – mother, multimillionaire businesswoman, jauntily knickerless recipient of an OBE from the Queen, dame, happily married to a man 25 years her junior – but one thing has remained constant: her sense of her difference from the bulk of other people."
"I think Brits have an unfair advantage when it comes to embarrassing themselves, especially when it involves bringing out the dead and going knickerless along the quay."
"Now, with the gender determined, Jamie Lynn Spears and her boyfriend can start planning for the baby in full, by buying it a range of Little Slutz knickerless play outfits and a My First Pressure Your Baby Into Fame So You Can Vicariously Dine On Its Flesh toyset."