Step 0: Cut off the legs. You don't want to cut too short. Cut off at around the knee.
Step 1: Take out the crotch seams. You want to take out the leg seams (inner thigh part) and up to the zipper and up to the waistband in the back.
Step 2: Then fold the top flap under and sew it down. You want the seam to be straight.
Step 3: You can make some decorative top stitching if you want. Hem the bottom and trim the seams on the inside.
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