Amazon calculates a product's star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers and factors that establish reviewer trustworthiness.
I have buy shirt before one week & in one wash color faded. Shirt is very shorted after washed. And you see shirt color in website and after you purchase this shirt then you see this shirt color is very different.