I spray a coat of shellac on to the leather and let it dry then i put my elastic string in and bam im done and wearing the mask.
Step 1: Tracing The Pattern
Print out the basic pattern I included then start to draw basic pattern. Look at picture to for example. Wet the leather then put the paper ( card stock) or tracing paper. then using a tracer tool Imprint the pattern on the leather before it drys.