Yep, it should be done in Max, and it should be the last thing you do. Poser requires that various group items have vertices in exactly the same spot, so if you have to modify the clothing later you have to be real, real careful not to disturb the seams. What I normally do is attach them all back into one thing, weld up the whole thing (otherwise you will se a seam the next time), modify it, then cut it apart for the next fitting. Sometimes it takes 4 or 5 "fittings" to get it right, but I tend to fit my stuff closer than some people do. Oh yes, it is going to a long journey, building nice fitting clothing is not a trivial task!