Basically, when you craft armor, there'll be, like, idunno. Sasquatch Helm, and Sasquatch Cap. They'll be comprised of similar ingredients, and cost roughly the same to make. However, all armor has preset skills on it. A Sasquatch Helm might have Sharpness +1, which increases the damage your weapons do, which a Sasquatch Cap might have Recoil Down, which reduces recoil after shots. You can probably understand why one of these would work for Melee, and another would work for range, but wouldn't work for both.