http://sewing.patternreview.com/cgi-...patternid=2375

The link above is the pattern I use. It is a multisize pattern, but I take freezer paper and trace (shiney side down) the size I need. You may need more than one piece of freezer paper, but it makes the pattern reuseable. When you get the pieces traced and cut out, iron the pattern to your fabric then cut your pieces out.
Be sure to get good quality lycra or at least double the fabric especially for the shorts. This pattern doesn't have a chamois, but so far I don't use a chamois on my navigator since I have a comfort seat. One thing I have done so that I don't have a problem with seams, I cut out double fabric for the center section and layer them with the seam allowances facing each other. That way you have a smooth seam against your skin in the crotch.
I use the AA or XXLarge pattern and it fits me well. I have a very large bust 50DDD and it fits across my chest. The shorts I'm getting ready to actually take in or go to the next size down as I've lost weight, but that's something that can also be adjusted with elastic sizing.