Trying to create first mod, game keeps crashing

hello! im super new to all of this.. ive been trying to make silly custom costumes for me and my friends to play around with but no matter what i do the game crashes when i try using these custom costumes

using blender 3.3 and the latest beta of sims studio

i made this random shape mesh to test stuff out. i unwrapped and rigged it. if anyone knows what i could be doing wrong id absolutely love to know! much love! :-)