It isn't easy. *The best fitting trousers I find as a rule are those which have been made or at least altered to fit me; but that only happens (for me) with suits. *
If you don't like baggy trousers or jeans, you are either going to be very uncomfortable (ie compressed into too small a space), or very blatant, or possibly a combination of both. *
Just a few other points:
1. *Some material will stretch over time to accommodate you better; and the longer I have been 'breaking in' a pair of trousers the more comfortable they tend to be. *
2. *In my case, since I wear myself pointing up (supported in a specially made jock); it tends to be a question of adding a whole waist size when I buy the trousers (ie 2 inches). *On the odd occasion I have let things hang down, and then I look and feel a lot slimmer in the stomach area, but the other problems I get make it a very bad idea. *
3. *If you did find trousers generously cut in the crotch, but tailored sharply everywhere else, it may be not such a great idea. *I once had a couple of pairs which were in the current fashion very tight in the leg and thigh and backside, but which gave me all the room I needed at the crotch. *Result: an enormously obvious bulge and a lot of unwelcome attention. | 
