First, you'll have to be ready to do a lot of preliminary tiral-and-error and go through a lot of paper. *heh* As it says in the first post, the large templates (last listed before the body diagram), printed at 97.3% of full size will probably fit a 6'1" individual -- depending on your body proportions (leg-to-torso ratio).
Once you find the right length for your body, tweak the aspect ratio to narrow the width until it fits your girth. And remember that it's going to be over a bodysuit and vest, so allow for that bulk.
Print out, cut out, tape together, use a loop of painter's masking tape to stick the pieces to a sweatshirt or some such to check the fit, adjust as needed, repeat...
That should get you started in the right direction. Let me know if you need clarification anywhere in there. 
Have fun, and good luck.
--Jonah
