The knitted jacket is very easy and knitted in one piece in garter stitch. using 3 ply yarn and 3.75 mm needles. The original pattern can be found here
Modifications: Made some modifications to keep it simple. Did not make buttonholes but finished jacket with crochet edge after sewing up sleeves with a flat woven seam on right side. Added one small flat button only to jacket and used a crochet loop from the edging as a buttonhole. Used 50 gm ball of 3 ply for jacket plus small extra amount of yarn for crochet edge.