Select the correct size western saddle seat to fit the rider. 13 inches; Small adult: 14 inches; Average adult: 15 inches; Large adult: 16 inches.
Tall riders often need a slightly larger seat to accommodate for the length A small to medium size adult will ride in a 15 inch saddle, a medium.
I know when a saddle is too long for a ponies back and I'm not thinking of putting saddles that are too big for the pony just to suit the rider - don't.
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A good rule of thumb for Western riders is that the English seat size is generally two inches larger than a Western saddle seat size. This doesn't.