You can also just buy the mleathers at the Auction House, but then you will need a lot of gold. So, check out my Skinning Leveling Guide if you want to level skinning. Leatherworking is the best combined with skinning, and I highly recommend to level these professions together because it will be a lot easier to get the needed materials if you have skinning.
This Legion Leatherworking guide will show you the fastest and cheapest way how to level your Legion Leatherworking skill up from 1 to 100.
