What is claimed is the ornamental design for a football sweater, as shown and described.
FIG. 1 is a perspective view of a football sweater, showing the new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left-side elevational view thereof;
FIG. 5 is a left-side elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines showing a person and team insignia in FIG. 1 are included for the purpose of illustrating the invention in use, and form no part of the claimed design. The shading on a hood portion, a jersey portion, and a sweater portion of the design are illustrated to show contrasting colors of the design.