stretch pattern to non stretch fabric
I would like to use a stretchy fabric sarong as a pattern to create a new swimsuit sarong. The orginal is one piece of lyrca fabric (unknown % of lyrca) with a napkin hem. My new fabric is 3 yards (58 inches wide) of silky polyseter (non-stretch). Should I place the oringal on the bias of the new fabric? Or should I add inches all the away around to compensate for the non stetch?