EvilInnocence's Crossdresser will allow you to fit V4 or V3's clothing to Miki.

I don't own Dreamwalker, but have you tried turning the part you don't like transparent in the material room? You may have to make a trans map if it's not grouped as a separate material, but that's a lot easier than modeling it yourself.

There's also this:

https://www.renderosity.com/rr/mod/bcs/frq-dynamics-jungle-fever-male-and-female/115942/

It's dynamic, so easy to fit to other figures.