We claim the ornamental design for a bra, as shown and described.
FIG. 1 is a left, front perspective view of a bra, showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a right, front perspective view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof; and,
FIG. 6 is an enlarged view of the selected region of FIG. 1.
The dot-dash broken lines represent boundaries of the claimed design and form no part thereof. The dot-dash square depicts the limits of the enlarged view and forms no part of the claimed design. The broken lines depicting the remainder of the bra show features that form no part of the claimed design.