Okay to start off grab all your leggings and all your other supplies and lay them flat on a table
Grab your leggings and make small marks along the inner SEAM, about 5 cm or 2 inches apart
Cut along these in a straight line to about the end of the legging
Then, criss cross the flaps over each other like so
Then grab your good old fashioned needle and thread (or sewing machine, whichever you prefer) and sew the flap onto the other side
Keep doing that all the way down, trying to keep your stitches as neat as possible
Thank you for reading, please like and comment! Sorry about the crappy photos, this is my first snapguide!