FASHIONABLE FOODIES: Who says fashion and food don’t mix? At Balmain, Julia Restoin-Roitfeld said she’s working on an eatery concept in the New York. “It’s going to be something very new,” she said, but declined to provide further detail. Meanwhile, Gaia Repossi, wiggling her fingers, showed off an oxidized gold ring from her fresh collaboration with Alexander Wang. “Pieces will enter Colette tomorrow,” she said.