Here’s a very simple example.
In the Game mode class (only exists on the server) I’m setting a cosmetics struct on the character class just as it’s spawned by the GM.
In the character class I’m using the cosmetics repnotify function to actually build the character on each client. Set the Mesh, Materials, Material Parameters etc.
Changes to the Cosmetics Config (RepNotify variable) have to be applied on the server.
Demo of it.