The ornamental design for a detachableshoestrap, as shown and described.
FIG. 1 is a top perspective view of a detachable shoe strap showing my new design;
FIG. 2 is a bottom perspective view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a right side elevation view thereof;
FIG. 5 is a rear elevation view thereof;
FIG. 6 is a left side elevation view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The broken lines showing a leg, foot and shoe in FIGS. 1 and 2 illustrate environmental subject matter and form no part of the claimed design. The broken lines on the surface of the detachable shoe strap represent thread stitching.