Inspiration for jumper or cardigan if cut down the middle? And I might cut up and lengthen the inner sleeve seam, this creating more of a side seam at the same time so it's not quite so revealing on the sides.
It seems like a fairly easy DIY to try. Just cut off most of a denim jacket,shirt,vest,etc. Sew on some chiffon or loose material. Would also be cute done to a flannel shirt.