My daughter wears a size 7/8 which is usually average, at least in the US. According to the table, size 7/8 is small. I don't know where this size came from, but I instinctively ordered it in medium and it fit my daughter like 7/8. The material is fairly thin, but not so thin that it can be cut off. Since I printed them out for our trip to Disney, I would have felt more comfortable if my daughter wore a tank top if there were any water rides (our first trip so I have no idea).
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