I have those shoes from NAS. Fit me true to size. Comfy insoles, good heel with just a little lift (not dead flat). Excellent quality. I wear 9.5 B. My feet are on the narrow side of medium width, high arches, low volume. I have many pairs of EF booties, shoes and sandals. Many of her sandals (slides, platforms) are too loose on me -- would fit a higher-volume foot. These are perfect.
If comparison brands helps, Paul Green 9.5 fits me perfectly all the time. Blondes have too much volume. SW can be anywhere from 9-10. AGL always uncomfortable for me, too short and wide. Cole Haan usually 9.5 in booties. Ecco I wear a 10, otherwise arch in wrong place (too short). Dansko 40 or 41, some styles too short for my long toes.