I read ALL the reviews on these ballet slippers and decided to order 2 sizes smaller than I usually wear.  Unfortunately I should have ordered 2 1/2 sizes smaller because they were still too big.  They also run very wide, which can somewhat be fixed if you tie them tightly.  Take my advice:  2 1/2 sizes smaller is the way to go.  I wear an 8 1/2 normally and should have ordered a size 6.