The ornamental design for a girdle, as shown and described.
FIG. 1 is a front view of a girdle; and,
FIG. 2 is a rear elevational view thereof.
The oblique lines and crosshatching shown in FIGS. 1 and 2 represent a sheer woven fabric.
The partial human figure shown in broken lines assists in illustrating how the claimed design may appear when worn and forms no part of the claimed design. The portions of the girdle shown in broken lines represent environmental structure that forms no part of the claimed design.