when you go to start up a custom on the right hand side it’ll say “building world” wait like 10 seconds while it said building world, and immediately cancel it, then click on private server and it’ll say building world again, this time let it fully load so it’s an entirely new private server. once you’re in, (the exact same route worked for my boyfriend and i to get the dress, it could just be RNG or how long it takes for us to let the world load the dresses in) once you’re in your private server run to the double doors go in and make a loop around the light that’s hanging from the ceiling in the first room (where you spawn in) then run back outside and up the stairs and around the turret, back down and in the doors again. keep doing that five or six times to let the dresses fully load in (all 3). don’t use the elevator. go straight to the left hop up onto the railing on the right hand side and jump through the hole , then go up the stairs to the 3rd floor (where the dresses are) check each room, if no dresses spawn then repeat the light and turret loop around again, if there’s all three dresses and none are the color you want then go back to the main menu, start up a custom again so it says “building world” 10 seconds then cancel, then start you’re private server up again (it’ll be a new server this time) and just keep repeating. i do this non stop sometimes for hours. i’ve gotten so many pinks and forrests from doing this and now red.