|Update 3/30/05 Updated photo link now that Photoworks has these available again! Unfortunately, PW is no longer one-photo-link friendly, so you'll have to view the slideshow to see the process.
I first saw the zipper in a pocket on a pair of Liz Claiborne pants about 20 years ago and thought it was really cool, but could not find a pattern to describe how to do it. I found a skirt pattern and a pants pattern that had the opening in the pocket, but the inner part of the pocket seam was just left open. It worked -- no more 'must get the zipper perfect' stress, but it was a bit drafty. It was just this past winter that it hit me that the zipper is in the pocket -- who cares if it looks really elegant or not? The next time I made the pants pattern (Simplicity 9589, long OOP but reviewed just the same), I stitched a zipper-length rectangle, about 3/8" wide 3/4" from the inside edge of the left pocket yoke piece (that's the piece that forms the side of the pocket closest to the body; the one you see when you look at the pants). I slashed to about 1" from the bottom, then cut into each corner (making a little triangle). I pressed the raw edges to the wrong side, zig-zagged them down, positioned the zipper in the opening with double-sided basting tape and topstitched it in place. From that point on, the pocket is made in the normal fashion. The waistband's edges are at the top of the zipper; sometimes I have to add a bit to the waistband to get it to work, but then I've learned to cut my waistbands at least 2" bigger than the pattern, just in case I have to adjust the fitting at the waist (ever so much easier to cut off excess than add more! )
Any pattern with yoke-style pockets can be adapted to put the zipper in the pocket like this. It's a really easy zipper application, and if you bobble on it, well, it's in the pocket. Shoot, the first time I did it the zipper didn't even match the fabric! It just doesn't matter.
One note: if you are moving the opening from the center front or back to the pocket, you'll have to rotate the waistband (i.e., the CF mark on the waistband will not be at CF for this application). There may be more overlap involved w/this process, too...just make sure you have a long enough waistband.