I have a similar problem ... they don't offer them with a 40" waist and a 36" chest. Apparently I'm built upside-down. 
So, an inverted triangle then?
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Thankfully my waist is still smaller than my chest, but my gambeson has gotten slightly snug in the mid-section.
It's funny, with a lot of garb out there, you can run into fitting problems if you're actually in shape. Most manufacturers these days assume a little extra slack is needed in the mid-section. But of course, if you're anywhere over that, you'll have issues too. It'll never be tailored to you if it's off the shelf.
That reminds me. I need to get in shape.
