My old vest is falling apart so I decided to spend a little money and get what I hope is something much better that would last significantly longer. I'm posting mainly to let everyone know that the size chart is right on only if you just wear the vest. I should have contacted Simms and asked them if vest sizing accounted for waders being under them. The person I talked to led me to believe sizing did take into account having waders under them. Get one size bigger. It would have been a really tight fit if I tried to zip it up. My problem is, there is no place local to try one on.