The ornamental design for a boot cuff accessory, as shown and described.
FIG. 1 is a front side perspective view of a boot cuff accessory having a decorative part made of cloth folded over an upper portion of a boot and an elastic part tucked inside the boot, wherein the boot forms no part of the claimed invention;
FIG. 2 is a front side perspective view of the boot cuff accessory of FIG. 1 in a folded condition showing the decorative part overlapping the elastic part;
FIG. 3 is front side perspective view of the boot cuff accessory of FIG. 1 in an unfolded condition showing the decorative part and the elastic part;
FIG. 4 is a rear view of the boot accessory of FIG. 1 in an unfolded condition showing the decorative part and the elastic part;
FIG. 5 is a top view of the boot accessory of FIG. 1 in an unfolded condition showing the decorative part surrounding the elastic part;
FIG. 6 is a bottom view of the boot accessory of FIG. 1 in an unfolded condition showing the decorative part around the elastic part; and,
FIGS. 7–10 are each a front side perspective view of the boot cuff accessory of FIG. 1 having the decorative part made of suede, leather, lambs wool, and fur, respectively.