older pattern MCClelland saddles... Cav troopers used their bed blankets folded in quarters for a saddle pad... that a pretty big footprint and I figure than amount of contact gives enough friction to keep the blanket from slipping.
Skirts in general... small skirts save weight... and scalloped skirts offer a bit more contact so some horsemen prefer them...
I like a generous skirt.. but my horses are big....small skirts look like a pony saddle is on my paint.