Do you guys tend to size up in measurement's this compared to a UHF if wearing as a shirt not jacket? / If the chest is 1 inch wider than my XXXL UHF which fits almost tight in the chest would this be too loose?

@tody Thank you for the quick reply!

Does anyone have the sizing info for the XXXL?

@goosehd Thank you for the reply.
Do you know how much the lining in this jacket plays into sizing?
I know the chest in the two shirts are 23.5 for the XXL and 24.4 XXXL.
So I dont know if I should buy the XXL with a chest of 24.6 or XXXL with 25.7 because of the extra bulk in the lining.

Sizing question.
If a XXL 9oz western is slightly tight on me and a XXXL is very comfortable, maybe even a little big, what size would be best for this jacket?

I have a 888 pair of XHSiB and SB (non-fade). I love both, but the SB are definitely more comfortable because of the pliability and breathability. Are the 21od roughly the same fabric as the SB's?
If there are differences are the od's more/less breathable, pliable, soft...