I humbly suggest, “What size do you wear?” Aren’t we already in the shoe department?
Wouldn’t it be strange to say, “So you’re looking for a pair of Chuck Taylors? What size is your bra”?
Given the constraints of the original questions, I would say, “What is your shoe size?” or “I don’t think we have shoes that big. Have you tried the clown store?”
Bandito, I think you’re closer to being grammatically on target. The shoe is “of” a particular size. Either that, or it’s “sized,” just as McDonald’s fries are “super-sized” and trucks are “over-sized.”
It sounds strange, though, to say, “What sized shoe do you wear?”
Chuck Taylor (1901-1969) was a basketball coach at Stanford University. He became associated with the Convese Rubber Company at some point. The result of the association is the Converse “Chuck Taylor” basketball shoe.
Although not a sports fan, I have a pair of red ones, sized 7.
Bandito, I think you’re closer to being grammatically on target. The shoe is “of” a particular size. Either that, or it’s “sized,” just as McDonald’s fries are “super-sized” and trucks are “over-sized.”
Hereabouts in historic American literature, naturally fluent Southern ladies & gentlemen have always been superior writers in general comparison with stiff, more pedantic Yankee counterparts—but they consequently assume the inherent risk of being labelled “regional” for it!