Quote - chinnei - gnd is a v3 morph.  v4 is a whole other figure.  for an example of the difference in level of difficulty, aery soul provides morphs for their custom characters (kielo, yaara)  in contemporary products.  they say they will not convert their clothing to v4 or any other figure because it would take them too much time.  everything i've ever read of clothing creating is that the shape is the comparatively easy part.  the hard part is joint parameters, grouping and poke through.

 
I should clarify, when I said "convert", it meant in terms of fitting the geometry of the clothing to fit other figures.  To me, this is the most time consuming part, probably because I'm very picky when it comes to geometry of the clothes.  
You might be right about grouping, since V4 has different chest and leg grouping, but I don't find it too difficult than changing grouping between other unimesh figures.  As far as making it conform, I let setup room handle that with few clicks of button using the already existing figure, or base clothing as a donor bone.  Even though I said GND, I've manage to fit several clothes to A3, V2, SP3, or even M3 and vice verse, using this way.  Like I said, it might take some time to getting used to at first, but once you get hang of it, this might be the best way to conserve all the V3 clothing that people have.