I claim the ornamental design for a strapless bikini top, as shown and described.
FIG. 1 is a perspective view of a strapless bikini top;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a left elevation view thereof;
FIG. 5 is a right elevation view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is bottom plan view thereof.
In FIGS. 1, 2, 3, 6, and 7, the broken line depicts bikini clasps and forms no part of the claimed design. Furthermore, the broken line along the perimeter of the bikini top depict stitching and forms no part of the claimed design.