The ornamental design for a Santa's holiday nightcap, as shown and described.
The file of this patent contains at least one drawing/photograph executed in color. Copies of this patent with color drawing(s)/photograph(s) will be provided by the Office upon request and payment of the necessary fee.
FIG. 1 is a front view of a Santa's holiday nightcap showing my new design;
FIG. 2 is a bottom plan view thereof;
FIG. 3 is a bottom, left side perspective view thereof;
FIG. 4 is a bottom, right side perspective view thereof;
FIG. 5 is a top, right side perspective view thereof;
FIG. 6 is a right side view thereof; and,
FIG. 7 is a top plan view thereof.
All sides not shown form no part of the claimed design.