Yep, it was finally time for a new vest and I got to learn that even within @firstmfgco sizing, there are differences you might not think about.
Here's a comparison between my old H-D 3-1 Vest, my First Manufacturing Co "Villain" leather jacket, and my new First Manufacturing Co "Signature" vest so you can get a real 1 to1, size to size look at how they all fit. I've yet to find a direct size comparison between FMC's vests and jackets so I may be the first to make note of it. I hope this helps anyone who's looking to order!
Also, I somehow managed to get myself partnered with First Mfg Co through shopify. So, if you need leather jackets, vests, gloves, or anything else First Manufacturing Co sells, here's a code for 25% off at firstmfg.com - 1CHASE_N