devtrackers.gg
I assume its gonna be a premium skin system like in path of exile. I know I know I'm compairing it to PoE again, but hear me out. There already is a "choose your cosmetic" function, I don't remember default keybinds to open it but it already exists, except that there are no cosmetic options yet other than pet.
K for kosmetics.
And no, that armor is not a mtx skin.