I claim the ornamental design for a two-piece bikini top, as shown and described.
FIG. 1 is a front view of a two-piece bikini top showing my design in use;
FIG. 2 is a rear view thereof;
FIG. 3 is a left side view thereof, the right side view being a mirror image of the left;
FIG. 4 is a front view of the first piece of the two-piece bikini top shown separately for clarity of illustration;
FIG. 5 is a front, top, left side perspective view of the second piece of the two-piece bikini top for clarity of illustration; and,
FIG. 6 is a rear elevation view of the second piece, shown in a flattened configuration.
The partial human figure appearing in broken lines in FIGS. 1-3 is for illustrating environment and forms no part of the claimed design. The broken line showing of a rectangular ring in FIG. 1 is for illustrating environment and forms no part of the claimed design.