Hahaha, good luck with that! Tree width depends on so many factors with English saddles. The tree points are all different lengths. Width is actually measured tree point to tree point on the bare tree...which is nearly impossible because of the panels. One makers narrow may be anothers medium.
You can measure D ring to D ring to give you an approximate estimate.
7" is medium, 8" is medium wide, 9" is wide, 10" x wide, 11" xxwide etc. but that's on the saddle's I've had so like I say...it's all different.
36 is pretty darn wide...that's like a x wide.
"Women and cats will do as they please, and men and dogs should relax and get used to the idea."