Before you sink a lot of money into anything for this purpose you may want to hang on a little while longer - I'd be greatly surprised and disappointed if the release of "David 4" was not within a month or two, I'd bet he's already in final QC at DAZ.  I'm actually pretty disappointed and surprised he's not already available.  I guess the Reby Sky marketing blitz took priority over, y'know, having a normal looking guy as part of your product line.

edit: I say this is likely because they got V4:Stephanie 4 working pretty well tech-wise, and having the Proportions bodypart scaling features implemented for M4:David 4 would not be nearly as hard as it would have been the first time around; it'd be new morphs that would take them some time to do.

You can convert clothing that is modeled and rigged for M4 to D3 but if it's a very complex model, it will be a lot of work for each item and the results may not be satisfactory.  For simple stuff without any "hard" detailing on it (buckles, snaps, pockets etc) it can work better though.

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