I had my pocket side 1 slightly longer than side 2 so I can overlap at the bottom of the pocket for strength. Sew.
Here's what it looks like complete. Iron flat.
Last time on my staff officer jodhpurs, I secured the pocket with metal snaps. I found on troops the snap would come open and annoy me. This time, velcro. Beats carrying your phone in your boot!
Hope this is helpful to someone. It is basic sewing for those that make their own uniforms, but an easy pocket for novice seamsters and someone who needs it done quick!