BrE response above.I'd like to check how particular words for underwear work in British and American English. Can you take a look if this is right:
(under)pants - used for men only? No. Women as well. "Pants" is more common than "underpants" these days.
knickers - women Yes
briefs - men and women Yes, although "briefs" for women usually describe a particular style of knickers.
undies - is it common at all in BrE? Very common.
underpants - men and women
panties - women
undies - women
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