The differences could mean that they are genetically different. What is the chance that a serf and someone of the higher classes would mate, or even want to mate in those days? The chances that it would happen in modern times is greater, and the characters vary more in the population.
Studying people of today, it is interesting to note the relative length of femur to tibia, and relative length of upper arm to lower arm, and other characters pattern makers must know so that clothing would fit the most people possible.
I'm sad that I'm not 20 again.
About femur characteristics and height:
The differences could mean that they are genetically different. What is the chance that a serf and someone of the higher classes would mate, or even want to mate in those days? The chances that it would happen in modern times is greater, and the characters vary more in the population.
Studying people of today, it is interesting to note the relative length of femur to tibia, and relative length of upper arm to lower arm, and other characters pattern makers must know so that clothing would fit the most people possible.