Thru trial and error (and $$$), I've learned a few things about purse carry. OTOH, there is still more to learn as I have never had to use them in RL. That is why when I post about purse carry here, i am always open to criticism and suggestions, pointing out holes, etc.
One thing I've learned that I havent read anywhere, is that to me, cross-shoulder purse carry seems most useful. Alot of marketing pics show strong shoulder carry. My (home practice) experience shows that the purse hanging off your strong hand shoulder affects your arm and aiming. If you are moving (as you probably should be), it can also slip down off your shoulder, onto your arm. Esp while drawing and raising your arm.
Purse carry/draw, just like holster carry/draw, is something that must be practiced and practiced too, to see what works and what doesnt.