One pair of shorts and some tinkering later, and another bag has arrived!
First, cut off the legs at crotch level parallel to the waistband (that way it won't be wonky!) Then sew them up. If you shape the corners of the bag, make sure you don't cut into the pockets.
With the remainder of the cut-off section, make two handles and add them to the inside of the waistband.
Then, make a lining with a pocket in it add a magnetic snap fastening. Turn the top of the lining down and sew it in place.
I originally added a piping cord tie to go through the belt loops, but that made it look like a pair of old pyjamas! So I made a tie from the same polka dot fabric as the interior and inserted it through the loops instead.
This is the reason why you don't want to cut into the pockets - because they are still functional! You can just see a pen in this pocket.
Perfect for meeting friends for lunch!