Can confirm this is happening in a vanilla game with NO mods or CC, all restaurants in any world. In Build Mode, when I click on Edit restaurant, choose employee uniforms, it begins to load then crashes to desktop before getting into CAS. I can edit/create custom menus, build and decorate just fine, this crash ONLY happens when you attempt to make your own outfit for waiter, host, or server!
Can confirm this is happening for me as well. It will load for the first category, but the other two it will immediately freeze on the loading screen, and crash.
I do use mods and CC, but since you tested on a vanilla game it's very likely related to the game itself.
