Custom bundle UV Chaos

i’ve been trying to make an R6 version of the Robloxian 2.0 Bundle with custom weights
these are my UVs in blender

then i exported this as .fbx, adding Shirt & Pants looks wrong

and when i exported that^ from studio and put it in blender to see the uvs, they changed completely

i’m genuinely struggling and there are no tutorials or documentation so all help is appreciated

nevermind, i followed this guide wrong Classic Clothing UV Mapping Guidelines[R15] i’m so dumb