I used the legs of the Goodwill leggings so I could get an already finished edge. The phone case is for the new phone coming on Friday so I made the pattern (the white thing) to fit my hand putting the phone into the pocket.
I only wear leggings with a top that covers to beyond my crotch (saving the world from having to see stuff they wouldn't be able to unsee). So no one will ever see this pocket. I'm really pleased with the results.