I'm 6'4",42" chest and I always buy small..............................and they never fit
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Seriously being a 32" waist normally medium(Dye,Eclipse)pants.
I'm a 40" chest I always buy large shirt (Dye) and I can easily get a sweatshirt underneath,the arms may be a bit short though for you though...
stringbean...
Sizes vary from make to make best ask who your buying them off of.