How to get shoe texture to apply just to the shoe?

Hey all,

I'm trying to convert these Japanese school shoes by Studio-K for toddler using the basegame bare feet. However, when I apply the texture to the shoes in either Blender or S4S, the texture applies to the feet as well.




So far what i've done to convert the shoes is:
1: take textures and mesh from original adult mesh.
2: open BG toddler feet and append the adult mesh.
3: deleted the unneeded adult feet vertices and edited so it would fit the BG toddler feet.
4: changed the texture on the shoes mesh to the texture from step 1.
5: joined mesh 1 and mesh 2 in blender.
6: imported to S4S and ended up with the picture above.

What can I do to make it so the texture doesn't apply to the feet? I'm willing to restart (I saved an additional backup blender file before I joined the two meshes together) if needed.

Thank you in advance (:



( package and blender files )