1) Start attached uniform_dupe_repro.Stratis mission with two players
2) Car is owned by the server, uniforms are added into the car by client
3) Player 1 (Server) opens car inventory and observes that two uniforms are not stacked
4) Player 2 (Client) moves both uniforms into backpack and then moves them both back into car inventory
5) Player 1 (Server) opens car inventory and observes that two uniforms are now stacked and bugged
6) Player 1 (Server) attempts to wear bugged uniform causing their current uniform to dupe. This can be repeated over and over times to create any number of uniforms. Same should work with vests as well.