Considering that most companies design and size their garments based on average dimensions, those who fall outside the average are often forced to compromise or get creative. If I couldn't get the fit I needed, here's what I would probably do:
Call the company (Sitka, FL etc) and explain the sizing issues. Let them make a suggestion. If that doesn't seem to work, ask them about getting your pants (or other pieces) altered to fit correctly and who they would recommend to do the work. Most of these good gear companies work with people who provide repairs or alteration services. You might even find someone in your area who has the skills to do a professional job for you. The downsides are extra cost and effort, but the upside would be hunting gear that fits better than anything you've bought off the rack.