The ornamental design for a combinationhat and mask, as shown and described.
FIG. 1 is a front, right perspective view thereof;
FIG. 2 is a front view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a rear view thereof;
FIG. 6 is a bottom view thereof; and,
FIG. 7 is a top view thereof.
The broken lines depicting the neck and eyes of a person wearing the combination hat and mask illustrate environmental details. The rectangular broken-line shape in FIG. 5 is a feature of the article to which the design is applied. The circular broken lines define the bounds of the claimed design. None of the broken-line subject matter forms a part of the claimed design.