If nothing new came in the shops inventory, it's only possible to buy the living underwear, if you didn't get it in the mainson at Marin's event.
I havent been able to access the shop, I dont know how.
Have you completed all there is to do in transylvania? If its the doir inside the building i dont think its in the game yet...
yeah i have the living underwear and done all quests, but cant access that shop, maybe it has to do with it being a old save from before the shop was available.
i would guess that may be it theres nothing to do in there yet anyway