I bought these a size 5/6 for my 5 year old son. He's skinny, about 45 inches tall, and these fit him really well. He has a really thin waist and I was afraid they would be too big and fall off, but they fit him perfectly! They're a bit long, but not so long that he trips over them, especially in his winter boots. They should be enough for the winter of next year, and that's exactly what I wanted. They are not adjustable but have good stretch on both sides of the waist. However, if your child is fairly vigorous, I would not recommend them. They didn't seem to have much insulation to me and the quality seemed that way, but they worked great for my son in the 34 degree weather. Can't tell if they were or not, it works in colder temperatures but he was hot in them and said they were comfortable. He played in the snow for about 2 1/2 to 3 hours and by the end his pants got quite wet but when I took them off I was pleasantly surprised as he was completely dry I brought him some sweatpants and jeans to put right underneath to wear but didn't need to layer.
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