Shoe Size Varies From Brand to Brand: MD Podiatrist

How can shoes be ill-suited for your feet? Let us count the ways. You could be wearing shoes that simply don’t fit. Maybe they’re a half-size too small, and they pinch your feet, or maybe they’re too large, and your feet are sliding around in them, which may cause blisters. 
 
You might not even be aware that you’re not always wearing the right size shoe for your foot. As Dan Michaels, DPM notes, shoes are cut differently, and you might wear one size in one brand but another size from another manufacturer. “Putting your foot into a size 8 is not always going to work, as you may measure larger or wider,” says Dr. Michaels.