Just saw a few styling pictures from H&M, and also few products laying round the high street with some ''innovative'' designs like belts, buckles and zips. Myself, I do own a pair of black swim shorts with such formal shorts cutting.
If you still think EW Harry, no way people would wear like that out. Have a look at these. From H&M.
Might end up copying few of them next month or so, when this "April Shower in May" stops :/