Originally Posted by Lexiie
SO just look at her from the front when she's saddled?
You're more likely to find any uneveness at the front than at the rear, and it's easier to spot.
If you put your hand vertically on the withers, (little finger against her, forefinger on top) you should be able to see if your forefinger points exactly at the middle of the pommel. If you've got a piece of chalk you can mark the saddle before you put it on, if that makes it easier.
With fingers you can also measure horizontally from the side of her withers to the inside of the gullet, on both sides, to check if the gap is the same. (I've found a point level with the top of the saddle panel is easiest for this).