The ornamental design for a jacket, as shown and described.
FIG. 1 is a front elevational view of the jacket showing my new design;
FIG. 2 is a rear elevational view thereof;
FIG. 3 is a left side elevational view thereof, the right side being a mirror image thereof with the exception of the rectangular hatched area on the left arm that is not present on the right arm;
FIG. 4 is a top plan view thereof; and,
FIG. 5 is a bottom plan view thereof.
The dash-dash lines in FIGS. 1 through 5 of the jacket are for the purpose of illustrating stitching lines and are part of the claimed design. The hatched areas, shown in FIGS. 1 through 4, represent contrasted surfaces unlimited by colors. The stippled areas, shown in FIGS. 1 through 4, represent contrasted surfaces unlimited by colors. The dash-dot-dash lines showing a person in FIGS. 1 and 2 of the jacket are for the purpose of illustrating environment, and form no part of the claimed design.