I'm having trouble finding pants that fit my tall, skinny 3yo. I splurged on some 90cm Hannas last year and they just slid off his butt. Now that he's 100cm they stay on his hips and come to the middle of his shins. Lands End has been recommended to me because of the slim sizes and built-in belts, but I see that only starts at size 4, and I'm not sure he's big enough for that size yet. As I said, he's 100cm and about 26lbs.