I had a pair of Simms Headwater waders, and the fit was awful.
My shoe size is 12/13, and that 's what I ordered, but it took quite an effort to get my feet past the ankle portion of the waders. I decided to take a chance with the Bean Rapid River waders. They make the Headwaters look cheap and poorly designed in comparison. I've been using the Rapid Rivers quite a bit for months, and haven't had a single problem. The fit is like a glove, and they are much more comfortable the that Simms. Just had to add my two cents.....
BTW: Not all Bean waders are good. The cheapies fit terribly, so my comments apply only to the Rapid River waders.