Topstitch pocket mouths. Sew pockets to their places on front pieces, simultaneously edgestitching them. Place front and back pieces on top of each other, right sides together. Iron interfacing to the wrong sides of the facings. Sew side seams of facings.
Place facings on it on overall's neck, right sides together.
Sew along top edges continuously from center front, around shoulder strips and along armscyes to back shoulder strips etc. Cut corners of seam allowances. Turn facings and shoulder strips inside and edgestitch. Sew buttonholes to back shoulder strips. Sew buttons on front shoulder strips.