This isn't a question, but an observation from my OW class. There were two of us who were really tiny, and it was a problem finding rental dry suits to fit. The shop ended up doing the best they could, but I got drenched in the pool in the rental suit. I was worried, and talked to my instructor, and was reassured that it would be fine in the salt water, because we wouldn't be doing the somersaults and such that we did in the pool.
As it turned out, the suit leaked badly in open water, too, and I got pretty hypothermic -- enough to scare me.
I also had a lot of problems because the BCs they had, even in small, were too big and shifted around me all the time, magnifying my instability.
I think it's really important to make sure equipment fits properly, especially for the small women.