sizesmith
Suede is a type of leather, and the process of using fabric dyes can damage the leather. Most shoe shops or a saddle shop if one's available, should have brown leather dye. Follow the directions on the package, making sure your boot is clean first, use the dobber inside the dye bottle, and spread evenely to make sure that you have enough. They must be cured for a day or 2 to make sure that the dye doesn't run onto anything, and be very careful wearing them in the house for a month, and if they ever get any dampness on them, as some dyes will run. I last bought leather dye for $4.69 for a 2 ounce bottle, which did the suede seat of a saddle for me.