Not sure why the company would do that, but the vest size is smaller than the shirt size. I bought this suit in size 3T for my two year old son and the only thing that fits him is the shirt, the pants are perfect in length because they are too tight on the stomach. The vest is smaller than the shirt so doesn't close it, my son wears a 2T-3T but for the pants and vest to fit him I would have to order a 5T which would be too long. shirt legs and sleeves. I will look elsewhere for a suit.
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