+1 on :
"Please do not spend the money on Men's bibs, unless you are built more like a Man. Cycling apparel companies are finally putting the time into developing great comfy bibs for Ladies, and we should show them that we are noticing that by supporting Women-specific items."

Additionally:
Personally I hate the Pearl Izumi Bibs. I have found that since the chamois isn't sewn down flush with the short, they give me something similar to paper cuts on the inside of my legs. I have had exceptional luck with the Castelli bibs. They are a little more expensive, but WORTH EVERY EXTRA DOLLAR! I bought one pair to see what they were all about and within a few rides, gave all my other pairs away (including all my PI shorts) and bought 2 more pairs.

I am a smaller rider, and perhaps that is why the PI shorts fit me poorly. I am about 5'3" and wear an XS in both brands.