Yeah, not really sure which icon to use there. On the hand, a sirt symbol I feel like would just be simple enough because a lot of people are used to looking for the shirts, and then they can just be pleasantly surprised by everything else, and those who know better, know better.
Looking through the list, I don't really see something that screams "store" without having the need to be labeled.
Maybe the money icon they have? I just feel like that might get misinterpreted as "donate/sub here".