The browbands should be backed with latigo leather which is sweat resistant. Try various thicknesses of small scraps to see what works best. Deer hide is one of the few leathers that can be soaking wet, retain it's shape and remain flexible when dry. With the latigo the smooth side would go next to the horse. You need to get an awl to push holes thro the leather. There is also a small tool that will mark out even holes for stitching. If you go with latigo, the two-needle technique is the only way to hand stitch leather. The technique is on you tube. If you can't find it, email me.