The ornamental design for a fitment, as shown and described.
FIG. 1 is an isometric view of a fitment showing our new design in the closed position, the fitment being intended for installation on a container (not shown);
FIG. 2 is another isometric view thereof rotated about 90° from the view shown in FIG. 1;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 is a right side elevational view thereof, the left side elevational view thereof being identical; and,
FIG. 6 is a top plan view thereof.
In the drawings, the broken lines depict environmental subject matter only and form no part of the claimed design.