They are so cute with red and blue trimmings - we bought them for a hike to wear with rainbow socks on crazy sock days. My daughter is almost 8 years old and we started choosing sizes up to a 9/10 which is still a bit big for her. I'd say that's how they fit - they could probably go smaller but I'm afraid they will be too tight around the waist. I would say they are probably true to size.
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