How to sew a separating zipper (not exposed)

How to sew a Separating Zipper (not exposed). Category: Raglan sleeve Jacket Fabric: Cotton twill Stand Collar and snap button Overlock all seam allowance Double fold hem No cuff No pockets No lining The white and yellow tape are just a “PP strap“. This is in order not to slide while sewing (sewing gap). When the thickness of the fabric is different, the pressure of the presser foot and the feed dog are not stable. Putting this strap means adding the height, this is very useful. These pink and blue are made of urethane foam with a sticky surface. It is very useful as a guideline for stitching. We buy them in a kind of professional shop in Japan. The information of this shop is secret. Sewing machine : DDL-5550N JUKI 1-needle overlock sewing machine : MO-3604 JUKI Paris collection, Tokyo collection etc... Sample garment factory Atelier Saison. We have sewed at Shibuya-ku, Jingumae in Tokyo for more than 35 years. *This is a mach