You could actually draft one if you have a measuring tape and some paper

Conceptually, an ear-band is a hat without the rounded top. Put a hat on your victim and measure around their head following the line of the bottom of the hat, but holding the measuring tape so that it will pass over the middle of each ear. Divide that number by 2 but DON'T add more for a seam allowance (the band should be slightly smaller than the head so that it stays on), now called measurement
A. Draw a line the length of
A on a piece of paper.
If you want the kind that are just straight all the way around, measure the height of your victim's ear and add 2 inches (one inch for clearance above and below the ear and one inch for the two seam allowances), measurement
B. At each end of line
A, draw a line going down that is as long as
B. Connect the bottoms of both
B lines, and double check that it is also the length of
A.
Alternatively, there is a kind of ear-band that is thinner than
B, but with a rounded portion directly over the ears that is
B. In this case, make line
B as long as you want (remember the seam allowances, though). Measure from the middle of the forehead to the middle of the ear, and call this measurement
C. On your piece of paper, choose one end to be the front and mark it so you don't forget which one it is. Make a mark that is
C from the front. Draw a line down that is
B. Connect the three up-down lines with a line that is straight, then curved down to
B, then curved up again, and straight.
And because pictures make the world go round:

The red lines represent the additional lines you need to draw for the second kind of earband. The thinner lines represent the seam allowances. I didn't measure anything, so you may not want to use my pic as a template, but rather draft one from scratch.
Fold your fleece in half and pin your now cut-out pattern to it with the FRONT on the fold. Make sure that the stretchiness of the fleece is the same direction as measurement
A. Cut two pieces, because one piece is the inside and one the outside (two different colours would make it reversible

). You'll sew each piece into a ring (correct sides together), and then sew the two rings to eachother along the top edge (correct sides together). Flip it correct-side-out, fold and pin the seam allowances to the inside, pin the two folded parts to eachother, and then sew along the edge about a quarter inch from the edge. You can also sew along the top edge about a quarter inch from the edge, just to "finish" it.
I really hope that all makes sense
