There's a semi regular article in Airsoft International all about gear for the pie addict. I used to wear MUCH bigger kit than I do now, lost 4.5st but have started creeping back up. Well...when I say creeping I'm back about 2st up.
Anyway, WAS stuff has always been big enough for the larger gent, on the whole there should be plenty of gear out there that will fit the main problem being that chinese knock offs tend to be sized for the Asian market. My AVS for example is a TMC clone and is based on the medium sized Crye one. I ought to be wearing the large one so it comes up a bit small on me (still fits but only if I don't eat too many pies at lunch) BUT it only ost about £80. Z shot make Crye licenced copies that come in the larger size but they come with a Crye licenced price tag too!