To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
I bought a size larger than I needed because I read the reviews that that run small. They do not run small AT ALL, in my opinion. My daughter is average for her age but especially tall and she’s swimming in the size I bought.