I claim the ornamental design for an apron, substantially as shown and described.
FIG. 1 is a front view of an apron with a removable piece attached;
FIG. 2 is front view of the apron shown in FIG. 1 showing partial detachment of the removable piece;
FIG. 3 is yet another front view of the apron shown in FIG. 1 showing the removable piece detached; and,
FIG. 4 is a back view of the invention shown in FIG. 1.
The sides, top, and bottom of the apron contain no ornamentation and are therefore omitted.
The apron is characterized by two parts connectable via a hook-and-loop fastener along a front side of the apron, an loops extends around the user's neck, and straps extend from the periphery of the apron.
The broken lines shown in FIGS. 2 and 3 represent the portions of the apron, which form no part of the claimed design.