Got my XL (42) 526L yesterday and did a one hour hot soak in the tub and drip dry. I tried the jacket on and off throughout the drying process to help shape it out.

Pre-soak measurements:

P2P: 22.75”
Shoulder: 19.5”
Body Length: 27.75”
Waist: 21”
Opening: 21.5”
Sleeve: 27”
Cuff: 4.75”

Post hot soak measurements (shrinkage):

P2P: 22.5” (-0.25”)
Shoulder: 19” (-0.5”)
Body Length: 27” (-0.75”)
Waist: 20.75” (-0.25”)
Opening: 21” (-0.5”)
Sleeve: 26.5” (-0.5”)
Cuff: 4.5” (-0.25”)

I’m happy with the fit though this jacket seems to run long. It's very stiff so I'm planning to wear it and maybe hot soak it again down the road if I need to tighten it up further.