The ornamental design for a brassiere, as shown and described.
FIG. 1 is a perspective view of a brassiere showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is a perspective view thereof.
The broken line illustration in the drawings is not part of the claimed design. The stitching (indicated by a dashed line with overlapping solid line) is not part of the claimed design.