From XXL adult sizes all the way down to toddlers. Sew by hand or on a machine. DIY beginner friendly fur Mongolian hat patterns with every measurement and stitching hole marked. Follow along with the video while you cut the pattern out, tape it to your sheepskin, trace, mark and punch the holes, then just cut out and sew. All you need is some chrome tan sheepskin. The sizing may be affected by the density and length of the sheepskins wool. With that said, using sheepskin similar to what I use in the video, the measurements will be as follows.

Extra small fits a 18" to 19.25" head
Small fits a 19.25" to 20.75" head.
Medium fits a 20.75" to 22" head.
Large fits a 22" to 23.5" head.
Extra large fits a 23.5" to 25" head.
Extra Extra large fits a 25" to 26.75" head.