Standard David clothing will work fine on David WM, including shoes.

The problems start when you go beyond everyday poses. Then the improved rigging of DavidWM will cause pokethrough.

It's easy to transfer the weightmaps to the clothes by:

Select your cloth --> click Figure-->"Copy Joint zones From..."-->Select DavidWM

But weightmaps are a lot more picky than spherical falloff zones so you will have to smooth the transferred rigging a bit inside the joint editor. (PP-2012 only !) Some clothes also have extra bodyparts.

In any case, if Outfitter can help transferring David-WM's weightmaps over to his clothing, feel free to set it up to work with David.