We claim the ornamental design for a strapless bra, as shown and described.
FIG. 1 is a front perspective view of a strapless bra, in accordance with the present invention;
FIG. 2 is a front-elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a left elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines depicting the human form shown in the drawing views represent environmental structure only and form no part of the claimed design. The broken lines shown on the article, represents stitching. The crosshatched pattern, although shown intermittently, is meant to represent fabric, and is understood to be distributed uniformly over the surfaces of the claimed design on which it is shown.