Tutorial, part 6a - Trousers Zipper

Cut off the excess zipper tape at the top of your invisible zipper and apply liquid fray preventer. 

Align your zipper at the center front so its top edge is ⅞" from the top edge of the trousers.

Your zipper will likely be a bit too long and need to be shortened. 

Determine how low you desire the zipper to extend down into the crotch area (probably a few inches from the inseam) and either pin or chalk mark the appropriate point on the zipper.

Form a new zipper stop at the point you pinned or marked by sewing a bar tack - that is, set your machine to a zig-zag stitch with a width sufficient to extend over the zipper coils/teeth and a length of 0. 

Cut off the excess zipper length from about 1" beneath the bar tack. 

Cut out the zipper teeth from the zipper excess beneath the bar tack. 

Now install the invisible zipper as you normally would, with the top edge of the zipper ⅞" beneath the top edge of the trousers, and close the lower center fronts beneath the zipper. 

Press the lower center front seam allowances open.

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