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 bought this T-shirt just because it seemed good to look, and also was 'Amazon's Choice', however the quality of this product is not worth paying 399 Rs. Stitching is worse quality, it also had stains!! It is not able to justify it's price. I returned back this product almost immediately. Ignore this T-Shirt!!