I ordered a size medium for my 5 year old son who wears a size small (or 5-6) most of the time. This set is just too big for him. That makes me think this kit runs small. Pants are probably closer to true medium, at least in length. He loves matching tracksuits and this has become his favorite this season :) We washed and dried it. Adjusted up dozens of times and it's holding up very well. The material is soft and relatively thick (read warm), so it's best used in colder climates or with children who like to be swaddled. Our son usually gets hot so he often takes his jacket off when he comes home from his morning break. At the same time, he uses a jacket much more often than pants. The only downside to this tracksuit is the price. It was easy for me to find well-known and unbranded tracksuits in local stores for half to two-thirds the cost of them.
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