subs. phr. (venery).See quots. and MONOSYLLABLE.
1754. FIELDING, Jonathan Wild, I. vi. (note). I shall conclude this learned note with remarking that the term OLD HAT is used by the vulgar in no very honourable sense.
1760. STERNE, Tristram Shandy, cxxvi. A chapter of chambermaids, green gowns, and OLD HATS.
1785. GROSE, A Classical Dictionary of the Vulgar Tongue, s.v. HAT. OLD HAT, a womans privities: because frequently felt.