OK 2ways to fix tis. problems is RDS no the UV Map. 1. re_create vertices & polygons, some time RDS doesnot fill polygon correctly,no display problem in RDS preview & render.but when U open itin other modeler, some polygons wl face to opp sides. U can see yr colth's obj preview in poser to found what's opp sides mean. 2. is easier, use compose 1.1 (DL fm free stuff if U don't hv it. it's poser fans' important uitilties). open yr cloth obj in compose and save abdomen wz [flip all faces] option. than del the abdo part in current group. than import the saved abdo and merged wz current file than save the whole group.I use same way to fix my obj exported fm RDS.