I'm 18 and I think I'm pretty much done growing, except maybe I'll grow an inch or two (if I'm lucky) in the next few years of college. I bought one suit pre-SF and it's not a suit I'm comfortable with wearing, and it seems to be a touch tight in the shoulders. Luckily it fits my dad so he wears it whenever he needs a suit. My body type is like the definition of skinny fat because I am pretty damn skinny everywhere except for a flabby stomach. I don't plan on being like this forever and I have started lifting for a couple weeks now to try and put on some muscle. I have no aspirations to be a big body builder and I really don't plan on getting physically bigger. My question is... In your experience, how much does suit size change?