The ornamental design for a compressionundershirt, as shown and described.
FIG. 1 is a front perspective view of the compression undershirt showing our new design, the view showing the compression undershirt in a collapsed configuration;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a right elevation view thereof;
FIG. 5 is a left elevation view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is a front perspective view of the compression undershirt in an expanded configuration;
FIG. 9 is a right elevation view thereof;
FIG. 10 is a left elevation view thereof;
FIG. 11 is a top plan view thereof; and,
FIG. 12 is a bottom plan view thereof.
The dash-dot-dash broken lines immediately adjacent the shaded areas represent the bounds of the claimed design. The evenly-spaced broken lines-in FIGS. 1, 2, 8 and 11 illustrate stitch lines that form no part of the claimed design. The broken lines form no part of the claimed design. The segmented lines, shown throughout the views, around the 4 pouches on the front of the undershirt represent contour lines.