I am looking to get a rescue pfd this year. I am 5'7 and 140 pounds and am looking to get something that will fit me for a while. (still growing a lot) I am currently in a stohlquist S/M, but it is getting small on me and I keep finding some really good deals on some L/XL pfds. My chest is about 38 inches. Would I be able to cinch up a L/XL pfd to fit me or would this be too big?