No Knickers Night Elf (commission) (Patreon)

I wasn't given a name for this OC so I went for the title of No Knickers Night Elf.
Just wondering if 'Knickers' is only a slang word for underwear in the UK?

I'm getting into the whole fantasy genre at the moment particular with the theme for this month's rewards which should be out a in a week or so.