Ok, so the jacket was delivered today, and have to say that it's a really poor fit, think the back panel that is causing it to look over sized. Ordered a 46 this fits more like a 48+ chest. Pit to pit measurements is 26" (wish I'd ordered a 44 now, not my normal size, but would have fit better)
Going to email wested and ask for advice, as can't wear it as is (I know it needs time to bed in, but anymore gape on those side pleats and I'd take off in a light breeze

). Screams to me that the solders/back panel are waaay too big. I did request under arm gussets, would this make the pleat gape?
Here are some pics for reference.
Back unzipped
Back Zipped (With Side tabs pulled in, as bottom of jacket bellows out at the front)
Side unzipped
Side Zipped
Arm Raised un zipped
