The ornamental design for a fittedmattress covering, as shown and described.
FIG. 1 is a bottom perspective view of a mattress fitted with a covering of the present invention, showing the design in accordance with one embodiment of the invention;
FIG. 2 is a bottom plan view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a right-side elevation view thereof, the left-side elevation view being a mirror image of the right side;
FIG. 5 is a front elevation view thereof, the back elevation view being a mirror image of the front;
FIG. 6 is a stretched-out view of the covering of FIG. 1, as seen from the outside.
FIG. 7 is a close-up view of the unmounted covering of FIG. 1, as seen from the outside; and,
FIG. 8 is a close-up view of the unmounted covering of FIG. 1, as seen from the inside.
The broken lines shown in the drawings represent portions of the fitted mattress covering that form no part of the claimed design. The dash dot broken lines in FIGS. 7 and 8 show the boundary of the detail feature views and form no part of the claim.