The ornamental design for a fabric, as shown and described.
FIG. 1 is a front view of a fabric according to my design;
FIG. 2 is a duplicate view of the design of FIG. 1 showing areas of details;
FIG. 3 is an enlarged detail view of area 3 circumscribed by broken lines in FIG. 2;
FIG. 4 is an enlarged detail view of area 4 circumscribed by broken lines in FIG. 2; and,
FIG. 5 is an enlarged detail view of unit area 5 circumscribed by broken lines in FIG. 2.
The broken lines in FIG. 1 depict boundaries of the claim and form no part thereof. The broken lines in FIGS. 2-5 illustrate the boundaries of the detail areas and form no part of the claimed design.