To my best knowledge, you can't shortcut it like that. You can't transfer morphs from V3 to your clothingmodel, because it's not the same mesh. V3 has a certain polygonarrangement and your clothing has another, they're different pieces of mesh and one can't take morphs from the other. You have to manually morph your piece of clothing to fit your needs. Or go with chinnei's final example which would also work, I think.