The ornamental design for a configurablemustachemask, as shown and described.
FIG. 1 is a front elevation view of a configurable mustache mask showing my new design;
FIG. 2 is a rear elevation view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a side elevation view thereof;
FIG. 6 is a front elevation view thereof with the mustache in a first alternate configuration;
FIG. 7 is a front elevation view thereof with the mustache in a second alternate configuration; and,
FIG. 8 is a front elevation view thereof with the mustache in a third alternate configuration.
The broken lines showing portions of the mask and a wearer are included for the purpose of illustrating environmental structure, and form no part of the claimed design.