Working on the premise that a normal suit coats pockets are about the hips, you may want to look for a shorter fitting (ie if you're a 40L try a 40R etc) this will mean the pockets are higher to start off with.

The sleeves will probably be an inch too short, but that is easy to fix in most cases (as long as their is enough fabric at the sleeve hem to let out).

There are curve templates taken from my argyll jacket in my gallert which might give you a starting point.