Parasitic twin is a rare malformation. which involves two fetuses attached to each other. whereby one of the pair is viable and develops into a mature embryo (the host twin) called the autosite. while the second twin (parasite) is usually nonviable. https://www.roneverhart.com/Playtex-Women-s-18-Hour-Ultimate-Shoulder-Comfort-Wireless-Bra-Nude-46C/