We claim the ornamental design for a safety vest, as shown and described.
FIG. 1 is a front perspective view of a safety vest showing our new design
in condition of use on a human figure shown in broken lines and forming no
part of the claimed design;
FIG. 2 is a front elevation view shown separately on an enlarged scale for
clarity of illustration thereof;
FIG. 3 is a side elevation view shown on an enlarged scale, the opposite
side being a mirror image thereof; and,
FIG. 4 is a rear elevation view shown on an enlarged scale thereof.