How to change clothes of models

This is the method I use.

First, match the shape of the clothes.

If you made the clothes by yourself, match the shape by using proportional editing.

Next, parent to armature (press shift while dragging).

Then select the clothes, put original model in Robust Weight Transfer source, and click Transfer Weights.

Finally, add Armature modifier to clothes, and select armature from original model.

After that, you should get working clothes.

credit: 東北ずん子 by は組！