You won't like my experience with ankle holsters. I was walking across an apartment complex with two children (5&6) when I was mugged by 3 guys. Realizing I had no possible chance of getting to my pistol in the ankle holster was a very sickening feeling. Luckily they took the money and ran. A couple months later an elderly man was killed in a mugging one complex over.
That's not to say they don't have their place. Just be aware they aren't easy or fast to get to.