Prep the fleece by cutting 2 pieces so they measures (for a 3-6 month old) about 17-inches wide by 7-inches high. If using a pant or sweater, feel free to take advantage of a pre-existing seam.
Prep the mustache by cutting the faux fur into a mustache shape. If not wanting to go free-hand, consider tracing one of these mustache shapes from <a href="http://buildabeard.tumblr.com/post/518428640/daily-stache-love-of-all-shapes-and-sizes-no">Build a Beard</a> onto wax paper and then cutting accordingly. The cut mustache should measure about 2.5-inches.
Sew the mustache to the front of the hat by hand. Next, with the right-sides of the fabric facing each other (the mustache should be facing inward), stitch along the edges of the hat. Press seams.
To create the ears, thread a needle and pinch a corner of the hat about 3-inches down. Insert the needle once and then wrap the thread around the corner several times. Secure, and then repeat with the opposite corner.