I'm currently working on Vogue 1323. And when I got to the welt pockets, the instructions were pretty bad. Welt pockets aren't necessarily hard. You just have to be precise in your stitching to insure that your welts aren't skewed. In the Vogue instructions, I feel that they added unnecessary steps that might cause a novice sewer to feel intimidated by this technique, which looks great when sewn well. I'm going to share how I do my welt pockets.
For this particular pattern, I'm eliminating steps 23-36.
Here are the pattern pieces for these steps. I'm only using #20.
I cut out four (3"x7") pieces from #20. These pieces are the (2) welts and (2) facings. I cut these in the same fashion fabric as the pants.
For the pocket bags, I cut two (15"x7") in lining fabric. I used a lightweight cotton. Take a 3"x7" piece of fashion fabric and turn under one edge (or you can serge it) and sew unfinished edge to the top edge of the lining fabric (wrong side to right side)... this piece will become your welt. Edgestitch the turned under end. Take the other piece and finish both edges. Sew 2" from the bottom. This is the pocket facing.
Cut a 3"x7" piece of fusible interfacing and center over the area for the welt box on the wrong side of the pants. Transfer the markings from the pattern piece. Or draw a box 1/2"x5" long.
Draw your welt box on the wrong side of the lining fabric on the backside of the welt area. Pin right-side to right-side on the pants, matching the lines. And stitch precisely!
Slash through all of the fabric down the center, stopping 1/4" from each end. And clipping diagnally into each corner.
Turn the pocket to the inside...
like this. And serge (or zig-zag) the top edge.
Fold down the top and press the welt opening seam.
And open it back out and press the entire thing.
To create the welt, fold up the bottom part even with the top of the welt opening.
Turn over and press the right side. Now you see your welt!
To hold it in place, edge stitch around, while making sure sure to keep the lining fabric out of the way.
Here's the what the wrong side looks like.
To create the pocket, fold the lining fabric up to the top edge of the pants.
Fold back and carefully stitch the top of the welt to the pocket fabric right above the welt opening seam. This is to secure the pocket fabric to the welt.
Stitch and finish the sides of the pockets and baste to the top of the pants.
Done! I hope this makes welt pockets a lot easier for you.