Yes, agree with 'panties' - nobody I know has ever used that word. Sounds so coy and twee.
And what about 'slips' - used by M&S for a certain type of men's underpants? Has anyone's Dh EVER said, 'Oh, I haven't got any clean slips,' or 'My slips are getting a bit holey- time to buy some more.' ?
Once upon a time a slip was a sort of petticoat - does anyone still wear that sort of slip under a dress?
I do say 'kids' but hate 'grandkids', which is utterly illogical, I know.
One word that really winds me up lately is REEsearch.
It's reSEARCH fgs!
Unless you're American, in which case I'll just about allow it.