So what you can do is bring it into maya or a 3d program, select the UV seams (as they will be the cloth seams as well, and then do what you will with them. I would recommend seeing if you can quad the clothing as well--I'm not sure how well MD4's convert to quad works but there's a way you can do it in maya.
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Not sure if this is any good but its worth looking into. If you don't care about the UVs you could also use z-remesher in zbrush.
https://sites.google.com/site/adamvanner/scripts-and-tools/marvellous-designer-quad-mesh-in-maya