There is only one ankle holster - It's a professional secret.
Renegade's Cozy Partner (Model 50).
They are in Phoenix, sorry I don't have better contact info.
If you can't find Renegade, you might check DeSantis, they made a knock off of the same holster.
The Cozy Partner is an 100% elastic pouch on a three inch velcro closed elastic band. NO straps, NO garter B.S.
Twenty years LEO, I have worn out four (about to order the fifth). When the Cozy Partner is put on it sinks slightly and turns behind the ankle bone and there it stays. Careful, you can cut off the circulation if you put it on too tight.