Harness Measurement

A. From one corner of the mouth, behind the ears, to the other corner of the mouth

 B.  Noseband 

 C. This measurement is for collar harnesses only. Using a carpenter's square and a straight edge, measure from the chest to the top of the neck along the shoulder.

 D. Heartgirth

 E. Height, in hands or inches

 F. Flank to flank over the top of the hips 

 G. Flank to flank around the hindquarters

 - Distance between the eyes, for long ears only

 -  Bit size.