I'll take the job.
I've got all this stuff from researching Pirates and other stuff like my ultimate Santa Suit. No problem. Use the Re-Act groups, they may be willing to rent you a kit, and you won't have to sew anything. Those guys are usually super nice and the same kind of dorks we are - just for History. Hell I'd be surprised if there aren't any here as members.
Sucks you're in Texas - East Coast would be easier to find that on. Check some local Re-Act groups as the Mexican Army had a red Coat that looked Rev. War under Santa Anna. That might work for you.
This is a pretty well traveled military history, so costumes are readily available. I've never found one for me - but I'm 6'6".
Looky here... One search...
http://cgi.ebay.com/1776-Revolution...ptZLH_DefaultDomain_0?_trksid=p3286.m20.l1116
I've seen better, but that's the first look. They sell em out of Hollywood all the time.
And here you go:
http://cgi.ebay.com/REVOLUTIONARY-W...ptZLH_DefaultDomain_0?_trksid=p3286.m20.l1116
Laffo.