This fit perfectly. Used the calf and length measurements, added the bit suggested and they fit perfectly.I ordered two different types of chaps for my granddaughter not knowing too much about them. These were far superior in quality & fit. My granddaughter is tall for her age/thin. I did have to return the original pair for the next size up as they were a bit tight (even after measuring her legs). These are leather, very well made & look like they will hold up well with her riding. I was originally worried about getting leather ones thinking they might be too stiff. They are not & she loves them!We absolutely love these half-chaps after trying both Saxon and Tuffrider brands. We were trying to save a bit of money by buying the cheaper brands, but you really get what you pay for with these. The quality difference is immense. Also, the other brands are sewn with a wide calf shape, so if your child has very thin calves, it looks like a weird protrusion.The reason I'm only giving 4 stars is because these run VERY small. My twin girls' measurements are exactly a Small Tall, but they were incredibly tight. The Medium ended up being perfect for them. If it helps, my girls are small 8 year olds- 50" tall and 52 lbs., with very thin legs.These half chaps have a great fit. My daughter is 10yrs old, slender legs and after reading the reviews I decided to order the Large. The Large fits perfect, not too tight but fitted; she will have room to grow for a couple of years. Ariat has great quality, they are sleek looking and stylish compared to the sued half chaps you can buy. I normally would not have spent the $69 price tag for these, but I had Amazon Points and glad I didn't pass it up. Very happy with the product and when these wear out I will replace with another pair, such a difference in quality.These are hard to measure for but the Ariat brand was the easiest and the fit was correctI have no complaints about this product or this retailer. Product arrived much faster than the estimated delivery date. I am having to return them because they are too small, most likely due to a miscalculation on my part. So far the return process has been simple and painless. I would highly recommend!Runs too small, had to return however what I can see the quality is amazingVery nice and of good quality, however and despite they are the correct size for my daughter (an average 6 years old girl) They are very tight calf resulting very uncomfortable.