REI has mountain bike shorts in XXL...they'll fit at least a 44 waist, have a supportive padded liner (like internal road shorts) but an outer layer that looks like ordinary walking-around shorts. The XLs I'm wearing now might be good for you, too. My waist is 39.999999 (down from 45), and they've fine on me. I've worn them or similar shorts for years--I gave up Lycra when I turned 50.