The ornamental design for an upside-down holiday stocking, as shown and described.
FIG. 1 is a front perspective view of an upside-down holiday stocking showing my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a right side elevation view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The upside-down holiday stocking is shown broken away in FIGS. 1-7 to indicate that no particular length is claimed. The broken line portion of the upside-down holiday stocking forms no part of the claimed design.