My wife's experience with a garter belt holster tells me I don't need to get near an ankle holster. The problem with any device that wraps around your leg is the leg is larger at the top and smaller at the bottom. Unless you strap the holster on so tight it's uncomfortable it's going to slide down.
"I do not aim with my hand; I aim with my eye. He who aims with his hand has forgotten the face of his father.
I do not shoot with my hand; I shoot with my mind. He who shoots with his hand has forgotten the face of his father.
I do not kill with my gun; I kill with my heart. He who kills with his gun has forgotten the face of his father."
I rarely do it as I'm not sure how effective it would be but it's still better than not carrying anything..... I have a Kahr PM9, 6+1 and about 16 ounces unloaded ...... not sure anything larger than that would be comfortable or concealable.
Albert Einstein "The important thing is not to stop questioning"