The ornamental design for a vest, as shown and described.
FIG. 1 is a front view of a vest (e.g., an electronics module carrier vest), showing my new design.
FIG. 2 is a rear view of the vest.
FIG. 3 is a right side view of the vest.
FIG. 4 is a left side view of the vest.
FIG. 5 is a top view of the vest.
FIG. 6 is a bottom view of the vest.
FIG. 7 is a bottom-rear-right perspective view of the vest.
FIG. 8 is a top-rear-right perspective view of the vest.
FIG. 9 is a top-front-right perspective view of the vest; and,
FIG. 10 is a bottom-front-left perspective view of the vest.
The shade lines show surface contour and not surface ornamentation.
The broken line showing of fasteners (e.g., straps and buckles) of the vest illustrates environmental structure, and the broken lines form no part of the claimed design.