Нашла на каком-то сайте как вшить молнию в брюки в картинках, к сожалению на английском языке, но и так все понятно:
*Reverse all directions if you are doing a mock fly for a boy/man*
For women, the right laps over the left. For men, the left laps over the right.
http://mamafitzz.tripod.com/mockfly1.jpg
First, I fuse some interfacing along the fly extension. If this were a real pair of pants, I'd also fuse a strip of interfacing along the pocket seam. The pins are how I mark things. I've also got a snip where CF is, and another snip 5/8" in towards the fly. Finish off your CF seam now.
http://mamafitzz.tripod.com/mockfly2.jpg
Next, stitch between the two dots, with a regular stitch. Then baste up the fly closed, along center front, with a long basting stitch. If you didn't finish off your CF seam before, do it now.
http://mamafitzz.tripod.com/mockfly3.jpg
Now press the left extension along the foldline (it's 5/8" from CF).
http://mamafitzz.tripod.com/mockfly4.jpg
Stitch the zipper in, using a zipper foot. Place the zipper bottom just under the dot that is marked on your pattern.
http://mamafitzz.tripod.com/mockfly5.jpg
Now lay the right fly extension onto the zipper and stitch, keeping the pant front free.
http://mamafitzz.tripod.com/mockfly6.jpg
On the front of the pant, press the fly to the right, and mark your stitching line. I use pins. Another idea is to make a template out of post-it notes or an envelope. Stitch.
http://mamafitzz.tripod.com/mockfly7.jpg
The finished mock fly, partially open.
http://mamafitzz.tripod.com/mockfly8.jpg
Here's the wrong side.