How to sew a 4 Hole Button (Double Stitch) of Hidden Button Bal Collar Coat

Main fabric : like a kind of Polyurethane (No information in detail) and it shrinks slightly after a certain period of time has passed after ironing.
Lining of bodice : Sleek
Lining of sleeve : Polyester

Full lining.
Hidden button placket.
Bal collar.
Raglan sleeves.
Welt pockets.
Inverted box pleat at the center back.
Waist and sleeve belts.

1 needle sewing machine : DDL-5571N JUKI
Button hole sewing machine : DIANA D-2002- BABYLOCK
Bar tack stitch sewing machine : LK-1900ASS JUKI

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