Processing pants zipper in front of the middle seam is similar treatment of the skirts is the same clasp withby putting the valance (see Fig. 84). 

  Treatment of a fastener in the side seam. When cutting trousers from the front and rear halves of the given stock the processing of the clasp. Cut seam allowance of the upper side of a fastener bendtowards the inside by 0.5 - 0.7 cm and zastrugivajut at a distance of 0.1 - 0.2 cm from the edge (Fig. 104, a). 
Cut seam allowance, forming the lower side of the chain, is treated with a facing, cut to shape of stock.
The facing applied to the front side of the seam allowance, forming the lower side zipper, face down and grind the item from the piping. Joint width of 0.5 - 0.7, see the Facing folded towards the inside, straighten the seam, forming, edging to the side of the piping with a width of 0.1 - 0.2 cm, and priorivet it. The inner section of piping bends at 0.5 - 0.7 cm inside. Bent cut scribbled at a distance of 0.1 - 0.2 cm from bent edges (Fig. 104,b).
After processing the edges of a fastener the front and rear halves of the pants is folded, right sides inside,call internal edges and fasten the bottom edge allowances for machining clasp double reverse stitching across allowances, then the parts rotate and grind off the side sections (Fig. 104,) from the front halves of the pants, aligning the notch or control the chalk marks. 
  Connecting stepper and middle sections of the pants. Stepper slices grind off front halves of the pants, aligning the notch or test the chalk line.
Medium-sized slices sew on the machine two-line chain stitch with the simultaneous pulling them or two lines on the sanding machine combining the stepper seams and seams primaqiune supers. Flatlock performfrom the left half. 
When you perform the wet-heat treatment seams rautureau or iron depending on the model.