Quote Originally Posted by khgulledge
if the saddle itself is the same width as my outside-outside measurements, does anyone think it would be supportive enough?
Hmm...I would think that you don't want your sit bones to be sitting right on the outer edges of the saddle. That outer edge is where the support frame in under the leather. You want your sitbones on the leather within that frame, so it can form to your bone contours, like a stiff hammock. Have you considered the Brooks "S" models, made for ladies and slightly wider?
In any case, I would call Brooks and describe your measurements and see what they recommend for you- they KNOW.