I claim the ornamental design for a vest, as shown and described.
FIG. 1 is a perspective view of a vest, showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a right-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 line showing a person in FIG. 1 depict environmental matter and form no part of the claimed design. The broken line showing the inside boundary of the pockets and the eyelet in FIG. 6 is for the purpose of illustration portions of the article and forms no part of the claim. The remaining broken lines represent stitching and form a part of the claimed design.