Thigh holsters suck at the best of times. They move around, especially if you need to run and the gun usually sits too low. Carrying a pistol every day for the better part of a couple of decades, I suggest a regular belt holster with perhaps a drop shank.
Winnipeg Police member shot by his own holstered Glock was using a thigh holster, make unknown at this time. Not sure if the holster played any part in the gun going off by itself. i am not a fan of these.