The main pattern on this jacket is a development of Barbara Walker’s Persian Twist from her Charted Knitting Designs. I have also used her explanation for the unusual central double increase. The special increase makes this a design for advanced knitters (or very motivated ones). The challenges are all on the right side rows leaving you to rest on the wrong side rows. Otherwise this is a classical shape with set-in sleeves.
You will also need 8 buttons.

Finished measurements
Chest 35½ (39¼) 43¼ (47¼) in
90 (100) 110 (120) cm
Length 18½ (19¼) 20 (20¾) in
47 (49) 51 (53) cm