Find some lightweight, stretch fabric, and wrap away. Bina used a material that consists of Rayon – Jersey. (Bina sells her wraps ready-made $42.50? which is not that unreasonable either, particularly since the wrap comes with a booklet on how to wear the various styles.) Middle Panel: 3x hip width (not circumference); Side panels: 2 width of hips. Length shoulder to knee. Slits 14" wide
DIY Audrey Hepburn inspired cape --- very easy directions (although I would make the buttons false and hide snaps underneath to make it even easier (and not have to finish the buttonholes). Only sewing would be edging.