*This tutorial originally appeared as a guest post at The Train to Crazy.
Cargo Pocket Tutorial
If you want to convert a patch pocket (in other words, a square) into a cargo pocket, just add extensions. My extensions are equal to my seam allowance of 5/8". In the photo you can see that I have added a seam allowance in addition to my pocket extensions.
It's easy to do a shaped or rounded pocket, too. Just cut a long strip (plus seam allowance on both long edges) for an extension and sew it around the edge of the pocket.
This is optional. I suppose it's highly unlikely the pocket edges will fray to pieces sooner than the knees wear out. But you never know!
Step 4: Press all the fold lines.
One set of pressed lines are outlines of the main pocket piece. The other lines will be at the seam allowance edges.
Pinch the corner, turn pocket inside out and stitch on the pre-pressed corner line, which is perpendicular to the edge. Before trimming, flip the pocket right side out to check. Repeat for the other corner.
Push the pocket extensions in and press. The fold will be centered.
This is optional, depending on how you want your pocket to look. Do three separate lines of stitching, rather than one long one around the pocket. Otherwise, when you turn the corner, you'll catch the folds of fabric.
The stitching you're doing here is just like topstitching; I usually start at the top edge of one extension, and go around the pocket, slowing down to neaten the corners.
Probably the trickiest part of the cargo pocket is positioning the pocket extensions so that they are stitched directly under the pocket piece. It's easy for them to slide outward.