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My daughter is a VERY small 11 year old and 10-12 seemed reasonable. She can only wear it under a tank top since the sides of the front nearly expose her non-existent chest. The fabric is thin, but overall I guess the product is what you pay for and at less than $3, it's not terrible and an ok backup until her new one arrives.
Not impressed with fit. Not a lot of elastic in the fabric. Just seems like a cotton bodysuit. I think t will stretch out after wearing it for class. Not a tight fit to her body. Gaps at chest and doesn't form to her lower back. Would not buy again.