I definitely second the 'slim cut' on this one. It is very slim.
My other IH jacket (IHJ-124-BRN) and all shirts (IHSH-328-GRN, HSH-330-BLK, IHSH-288-IND) are size L, and they are all generously-sized for my frame. I even tracked down another Type 3 modified in a store (IHJ-121-IND) and size L was the right size. The chest (P2P) measurements for the green IH-526-ODG are narrower, but I thought it would be ok.
But when the IH-526-ODG arrived, it was fine everywhere, except across the chest. Noticeably tight, to the point that when I puffed up my somewhat puny chest, the front was pulling the buttons apart.
Other than that, it's such a lovely jacket. I just printed the return label... Sigh.
XL is not available from IHUK, but I tracked one down through Garmentory, shipped from Brooklyn Clothing in Canada. The dumb things we do for Iron Heart: a Japanese jacked, bought from Canada, shipped to Australia via the US