I used the Stride Rite E-fit chart on their website, and my son's foot measures an 8 1/2. This is such a larger size than he wears in other brands (See Kai Run size 7, Preschoolians size 23, New Balance size 6 1/2). I am just wondering if I should trust the chart because I don't want to buy shoes from ebay only to find them huge. So, would you consider their size chart to be accurate based on your experience? Thanks!