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.
Add fabric to upcycle shorts. Place fabric over shorts, trace outline of pocket + or extra, cut, then fold or place in pocket and sew (you fold that extra fabric so it looks like a professional seam). Then add fabric to the bottom and your done!