Hmmm, this mixture between windows and UNIX is weird for me. And for sure, I'm not a windows expert ...
Line 405 in material.py tries to evaluate the Diffuse-Texture pathname from the .mhmat file. The pathname might have a problem in this file. You can e.g.:
change the path use '/' instead of '\' in this file.
- or -
delete all the lines containing pathnames in the .mhmat file.
Maybe throwing away the complete .mhmat file also works.
Then you will only see a grey shadow of your clothes. In this case (and in all other cases also) use should use the material editor (must be activated), change the material until you are satisfied (phong shading or use diffuse texture, whatever you want) and save it in the same directory.
.mhmat, .mhclo, .obj are plain ASCII, the .mhpxy and .npz files are created after the first successful load in MH, so usually the date of these files must be newer than the ASCII files.