I have Aero C3 in that size. It's amazing. Not going to sell it mostly because I wear it a lot but also because they don't pop up often enough used, so basically I'd have to go buy new again if I wanted one.
So just wanted to tell you:
they're awesome (a pocket would be nice though. Outlaw is cut higher/tighter but has pockets)
you'll probably have to buy new (maybe wait for Aero 10% off sale from time to time)
I have a large that I had to get wet and dry in the sun to bring down a half size. There's a big gap between M and L size, at 42 chest you might be good with L (I'm 41 chest and L was pretty baggy in the waist area)
The Thedi version is amazing, look at that one too
If I ever change my mind, I'll definitely let you know.
Thanks for your help here--good to know the diferences between the C3 and Outlaw! I think I'm either going to have to wait a LONG time and be lucky (keeping an eye on Aero's sale page), or bite the bullet and go new!