The ornamental design for a decorativeelement for a vehicle body exterior, as shown and described.
FIG. 1 is a front view of a decorative element for a vehicle body exterior according to the design;
FIG. 2 is a left, front perspective view thereof;
FIG. 3 is a right, front perspective view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is a rear view thereof.
The broken lines in the drawings and the lightened areas within the broken lines illustrate portions of the decorative element for a vehicle body exterior that form no part of the claimed design.