"WingSelector" in Persona window?

[Seagoat]

Hey guys! I'm getting back into modding after a couple years away, and I'm in the process of reconfiguring the Persona window to replace my old Inventory mod.

There's a icon in Persona > MainPage > Inventory > AppearancePage called "WingSelector," and I have no idea why it's there. Basically, I'm wondering if this is a necessary/used element -- and if so, who sees it and what does it do?