My foot is a size 9 1/2, and when I buy designer ware it fits every time.  Other brands of sandals I normally wear a size 10, which is what I first purchased in this sandal.  When I received and tried on they were too small but very cute, so I thought I would try a size 11, even though I have never worn an 11 in any brand.  When they arrived the length was perfect, but the straps were too loose.  My opinion - the shoe was not manufactured correctly in all specs.
I love Skechers brand and have another pair of sandals that fit perfectly and have worn for about 5 years now, also love the casual tena shoes they have and they fit to size.