As one of the House Apologists for Ankle Carry, I missed out on this thread! Shoot!
While I agree with the enormously good points made in regards to the disadvantages of ankle carry, I still carry on the ankle for about 45-50 hours a week...it is my only comfortable option, and it beats not carrying at all, which was my previous modus operandi in that situation. Other times I carry in the pocket or elsewhere. I look at it with the same logic as I do .380ACP...its not the best self defense caliber by any stretch, but its the best available that is feasible in some environments due to its size, so that's why I often carry it. And my khaki dress pants have stupidly shallow pockets, so pocket carry isn't happening!
The P3-AT is an impressively easy gun to carry on the ankle. I have a Fobus ankle holster for it that I wear 8 hours a day and it has never bothered me once. The gun is so light it does not need a calf-strap (which tended to be very uncomfortable to me with other guns) and it doesn't move much at all. It rips out of the holster with ease and does not print with dress slacks. The one major fault I have with it is that it, being a Fobus style polymer holster, can be knocked loose if you are not careful (meaning, your other foot kicks the gun upwards...not a likely movement, but a possible one), and for that reason I am awaiting a Nevada Gun Leather ankle holster with a retention strap. Which, if it is a quality holster, is a steal at $39, in molded leather. But, I've not heard much about them and haven't seen or tested it yet, so I'm taking a bit of a chance.
The Fobus, though, is a great holster...I just wanted a bit of extra security in the form of a retention strap, to make deep concealment ever so slightly deeper.