Oooh I sympathise with this problem, took me ages to track down shorts that weren't sized for whippets ( for the record, for any cycle clothing manufacturers or retailers reading this, XXXXXL does not mean fits 34 inch waist in any normal universe ).
Agree about Aerotech designs. And also about Hoss Technical Gear in the US who do shorts for Clydesdales as the yanks put it – they don't appear to have a distributor or outlet over here which is a shame and their website failed to acknowledge the existence of any country outside the USA last time I looked, although they have supplied me direct before now for the cost of an overseas phone call. More recently I sourced a second pair through ebay from a dealer in the USA with no problems.
Finally Wiggle's own brand DHB do big sizes ( and XXL comes up at about 44 inches ) although they seem to be temporarily out of stock of baggies.