The ornamental design for a wearableflashlightholder, as shown and described.
FIG. 1 is a perspective view of a wearable flashlight holder illustrating my new design;
FIG. 2 is a front elevational view thereof, with a flashlight and a retaining clip situated therein;
FIG. 3 is a right elevational side view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
In FIG. 2, the broken line showing a flashlight and retaining clip situated within the wearable flashlight holder is for illustrative purposes only and forms no part of the claimed design.