Pick your colors - for this pattern, I've used only about 12x15 inches of pink for paw and ear trim, 1/2 yard of purple (main) color fleece, 1/3 of a yard of cream (contrast) 1/4 of a yard of black (trim) fleece.
Project will probably take about 2 hours, maybe less.
Print and cut out all pattern pieces. The only piece that is not a full size pattern is the hat dome, but there are instructions on the pattern image for making it for your size. This hat base will have trim added to it in the second step.
Step 1: Cat hat part one
Pin ears on the inside of the hat base as shown, stitch the full length of the round edge, right sides in. Go slowly over the ears, leave bottom (head opening) open.
Step 2: Cat hat part 2
As in photo, insert top edge of the trim inside the hat, with the hat right side out and the trim piece wrong side out. Overlap will help stiffen the hat base. About 3 inches of fleece will be inside the hat. Stitch 1.5 inches from the bottom edge of the hat, all the way around, so the two pieces are attached.
Fold the trim over to the outside of the hat. Change stitch to 1.5 or less and 4 out of 5 on a wide zig-zag stitch. Right on the edge of the trim, just inside the black, zig-zag stitch all the way around. The zig-zag stitch eliminates an open edge. Doing the stitch in the middle of the edge instead of just inside the edge will make the fleece want to roll up under your needle.
Step 3: Scarf paws part one
(while you have the pink or whichever paw color thread in your machine, stitch the nose to the mouth in the same manner)
Step 4: Scarf part 2
Stitch all the way around the outside of the scarf, except for a 3-4 inch opening in the middle of a long edge. This part will most likely be behind your neck and less visible when closed from the outside.
Turn scarf inside out, then stitch the hole closed by folding the fleece inside and using white and black or appropriate color threads. Stitches disappear pretty well in the fleece anyway, so it still won't be very visible. Press flat or cool iron if desired.
Step 6: Face mask
Step 7: You're finished!
As an option, you can easily add a matching tail by cutting a long rectangle of your main fabric color, and a short rectangle of the contrast color. Stitch together to make one long rectangle, then fold/stitch into a tube, turn inside out and stuff. stitch closed and add strings to tie to the back of your belt.