I'm an adult but I wear a child size 2.5 and ordered 3. You have enough space to put them on and take them off, even with thick socks. I would recommend trying them on if you use them as indoor shoes like I do. No leaning, adjusting or folding the detachable liner, etc. with extra space. With a heel, you'll definitely want to wear socks in the winter. They feel like bouncing houses underfoot.
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