The ornamental design for a frame for sunglasses, as shown and described.
FIG. 1 is a perspective view of a frame for sunglasses showing our new design thereof;
FIG. 2 is a front view of the frame for sunglasses shown in FIG. 1;
FIG. 3 is a rear side view of the frame for sunglasses shown in FIG. 1;
FIG. 4 is a right side view of the frame for sunglasses shown in FIG. 1;
FIG. 5 is a left side view of the frame for sunglasses shown in FIG. 1;
FIG. 6 is a top view of the frame for sunglasses shown in FIG. 1; and,
FIG. 7 is a bottom view of the frame for sunglasses shown in FIG. 1.
The broken lines shown in the drawings are included for the purpose of illustrating unclaimed portions of the frame for sunglasses and form no part of the claimed design.