So, went an a hunt the last few weeks compare the RMC N-1, the Buzz Rickson's N-1, and this bad boy in XL and XXL (from Fountainhead NY). And definitely came away with the (as expected) realization that the IH oiled N-1 is indeed the best for me. Just more substantial, and the oversized collar just looks great.
Definitely was the right choice swapping up to an XXL for this (from my old L in the old olive drab). The XL also might have worked, but I could tell it was still going to just be a bit too snug when layering. Just got tired of not being able to wear over a sweater comfortably, and wanted a bit longer of a body length. Maybe not the way everyone wants it, but I wanted more of the Paul Newman N-1 fit, which this is a little closer to now. I just like the fuller fit on this. I'm definitely happy this new model shortened the sleeves a bit, makes this work for me.