The ornamental design for a reflectivesash, as shown and described.
FIG. 1 is a first environmental perspective view of a reflective sash showing my new design being worn by a user, the reflective sash including a strip of reflective material centrally disposed between strips of a less-reflective material;
FIG. 2 is a second environmental perspective view thereof;
FIG. 3 is a third environmental perspective view thereof;
FIG. 4a is a front-side perspective view thereof;
FIG. 4b is a rear-side perspective view thereof;
FIG. 5a is a front view thereof;
FIG. 5b is a front tip-end view thereof;
FIG. 5c is a tip-end view thereof;
FIG. 6a is a back-end view thereof;
FIG. 6b is a rear back-end view thereof;
FIG. 6c is a rear view thereof;
FIG. 7a is a first side view thereof; and,
FIG. 7b is a second side view thereof.
The design details shown in broken lines form no part of the claimed design and/or are used to depict environmental subject matter that forms no part of the claimed design.