A2 Lining type

[Alliance507]

Good info. Thanks @coolhandluke

 

[TrainDriver]

I would normally say to find a contract that has a wider back panel and shoulders, but your RW should meet that criteria. A contract with inset sleeves will help as well.

Based on your photos, the shoulder width looks disproportionately narrow, which is likely the root of the issue. I believe the rear shoulder measurement should be at least 20" in that size/ contract, so 5*'s pattern might not be entirely accurate for a size 48 23380. Changing the liner material isn't going to make any appreciable difference. You might go one size up and have the sleeves, waist, and chest measurements tweeked a bit (or stick with a 48 and have the shoulder width and pack panel measurements increased). Wearing a tag size that is 6" larger than your chest measurement isn't completely uncommon.

Do you have any pics of you wearing the jacket that show how it fits?

Here's photos of a GW 23380 showing proper fit. Plenty of room in the back and the shoulder seams fall down below the edge of the shoulder.

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Though these pics aren’t nearly as good and my body not nearly as flattering, these are the only pics I have…

The one with me reaching across my body is what I call the “seat belt test”. That’s how far my jacket let’s me reach back to grab my seat belt before it stops my natural reach and I have to turn my body the rest of the way.

 

[coolhandluke]

Just my opinion, but I think that you need to take one size larger.