Originally Posted by
mshred
pretty easy to measure your sit bones at home. i put a folded up towel on a wooden chair (coffee table might work too) and put foil over it. sat down on the foil and my sit bones leave a nice indentation. measure the distance in mm between the indentations and you've got your sit bone measurement. i did it 3 times and took an average just to be sure i didnt screw it up the first time.
this, and similar ways would probably work, and would be much cheaper than just buying saddles until you find one that fits. Its actually kinda similar to what is done in on of the well known fit sessons, BG I think.