He's about to protest that surely Ianto doesn't have to wear it all the time when he grinds to a halt suddenly, and John is walking close enough that he barely avoids bumping into him before taking a step back.

"What?" he responds, and then realises that isn't perhaps eloquent. Then -- "Well, I guess it bothers me if you're getting in trouble because of this thing."

Since it does, after all. Whatever sort of gift it's meant to be, it isn't a good one if they're fleeing a shop because of it. Gifts that put you in danger are bad gifts, however fancy or expensive they might be.