How to sew a 4 hole button (double stitch)

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 More about our Channel Membership: Join our Channel Membership: 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 *This is a machine translation and may not be a perfect translation* #Sewing