The ornamental design for an hairattachment, as shown and described.
FIG. 1 is a side view of the hair attachment of the instant invention;
FIG. 2 is a top view thereof;
FIG. 3 is a perspective view thereof; and,
FIG. 4 is a pictorial view of the hair attachment, the broken line showing
of the human form and securing means is for illustrative purposes only and
forms no part of the claimed design.