Oh, THAT is the Moss Ivy you were referring to... It MIGHT just be a matter of playing with the scaling dials; so far the few uses I've had for THorne's characters haven't required any different clothing, so I haven't run into this problem myself! If you're on a PC, Uthena's suggestion is the best bet; if not, you'll have to either play with scaling on your own, or maybe talk to Thorne about it.