@corralitos I think it’s typical to size down in this vest. Since the P2P sits a bit lower than where your shirt pit sits, your body typically will be a bit slimmer there.
I have this in large and I wear an xl in IH shirts.
And to go a bit deeper. My best fitting IH shirt in xl is my IHSH-91 which has a P2P of 22.5
My size large IHV-02 has a P2P of 20.25” and I can wear the vest over the shirt (albeit a bit snug).
I will also be my own contrarian and say if you feel between sizes you can cinch the back to snug it up. I could fit an xl in the -02 but only wear it over T-shirts so the large works for me.









