"Dem bone, dem bones, the leg bone's connected to the knee bone, the knee bone's connected to the thigh bone, the thigh bone's connected to the hip bone..." is a song children have sung for years ...
I'm Ally Head, Marie Claire UK's Senior ... a leg length 21 is the shortest length option, and 28 is the longest. They're also listed in US sizing - so for a UK size 10, you'd need to opt for a lulu 6 ...