This whoopin' belt is made of two layers of full grain leather, glued then stitched together.  1-1/2" wide with antique brass hardware.  The length is measured from the heel bar of the buckle (where the leather connects) to the middle hole at the other end; see diagram.
 
Non-removable hardware.
 
Typically, add 2" to your pant waste size. So if you wear a 34" wasted pant, you'll need a 36" belt.
 
If you want a custom size, state your request in the notes when ordering.