The ornamental design for a sheetmaterial having a pattern, as shown and described.
FIG. 1 is a perspective view of a sheet material having a pattern embodying our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is bottom view thereof.
The broken line forming a perimeter to the front plane of the sheet material having a pattern shown in FIGS. 1 and 2 depicts the boundaries of the claim and forms no part thereof. The broken lines illustrating the sides and rear of the sheet depict portions of the sheet material having a pattern that form no part of the claimed design.
Within the top plane, the broken lines and areas they surround are portions of the article that are not included in the claim.