I’ve owned a few Iron Heart N1 deck jackets. Always check the measurements carefully, but generally the following rules hold true:
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Buy the same size as your Iron Heart western shirt size if you want a comfortable fit with room for an UHF or a sweater etc. But be prepared for slightly longer arms than ideal (not a problem once the creases bed in).
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Size down one from your Iron Heart western shirt size if you want to wear it with just a t-shirt. It’ll be a little snug in places (eg shoulders) but, depending on your style, might look like a better fit. I personally find this option a bit too restrictive eg if I’m doing anything other than just walking around. For example, it’s a bit restrictive when driving or lifting things.
Obviously everyone’s different, but the above statements have proved to be true for me and many others.