LightWalker
Flashlight Enthusiast
It has a flap with velcro to hold the light inside the holster. Looks like it will fit the Fenix L1D/T and Inova X1 lights well.
http://www.defensedevices.com/holster-x1-inova.html
http://www.defensedevices.com/holster-x1-inova.html