The ornamental design for a rainjacket, as shown and described.
FIG. 1 is a perspective view of the rain jacket of this invention;
FIG. 2 is a front view of the rain jacket of this invention;
FIG. 3 is a rear view of the rain jacket of this invention;
FIG. 4 is a top plan view of the rain jacket of this invention;
FIG. 5 is a bottom plan of the rain jacket of this invention;
FIG. 6 is a first side elevation view of the rain jacket of this invention; and,
FIG. 7 is a second side elevation view of the rain jacket of this invention.
In FIGS. 1-7, the thinner, short-incremented broken lines within the jacket depict stitching and form no part of the claimed design. All other broken lines depict portions of the rain jacket that form no part of the claimed design.