The ornamental design for a threedimensionalcollar, as shown and described.
FIG. 1 is a front perspective view of a three dimensional collar showing our design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a first side view thereof;
FIG. 5 is a second side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom thereof;
FIG. 8 is another front perspective view thereof; and,
FIG. 9 is another top view thereof.
The drawings include surface shading that represents contour and not surface ornamentation. The broken lines illustrate environmental structure and form no part of the claimed design.