French knickers
noun1
UK A type of full-fitting women's underwear and/or sleepwear.
- For this reason, any woman would much, much rather receive a pair of silk French knickers trimmed with antique lace that require handwashing in Evian water and which she will never actually wear than the three-pack of tummy-control pants from M&S that she desperately needs.2004 December 3, Jess Cartner-Morley, “Present perfect”, in The Guardian: