Help my cc is floating, weight problem ?

Hi.
In newer versions of Blender one must take an extra step in the process of Weight transfer:
1). Select the reference, Shift-select your garment, switch to Weight paint, click on Transfer Weights, choose By Name;
2). Click on Clean, select All groups;



You also need to transfer a uv_1 map.

The arms are not vertex painted with 00FF00.
You could also utilize the uv space in the uv_0 map more efficiently. You can use all of this

Also you transferred weights from something that has foot and toe vertex groups but cloned to start a package something that does not. This may cause distortions
What you should do is clone ymBody_EF10Noctis instead, it has one meshgroup and right vertex groups.