Morph Magic can load morphs into clothing.  I have used it a lot for adding the D3D and RDNA morphs to clothing for TY2, Miki 2, Poser 7 and G2 figures.   I haven't actually tried installing any of my own morphs, but I assume it would work just as well for that.    I've had the odd oddity, but mostly it has worked successfully.

One important difference between WW and MM is the fact that WW works inside Poser and MM doesn't.   Some people prefer WW (partly) for that reason, I believe, but there are advantages both ways.   I think WW requires more planning for a complex scene.   Once you have two characters, known to WW, in a scene, I don't think that it has a way to identify the character which is the intended target.   I'd love to be wrong about that, by the way, so please correct me, if appropriate.   With MM, you go outside Poser, load the character that contains the needed morphs and thansfer them into pieces of clothing.   It can take a while and the files created can be very big, with implications for Poser's performance.

I like both and use both frequently.