So I used the same leather for all parts during this instructable but by having two separate pieces of leather you can have a different liner leather. This is especially important when working with more exotic materials like crocodile leather as it is not comfortable against the skin. I just always use the two piece design so there are more options.
Leather Watch Strap: Hand Made or Laser CutView Instructable »
This looks great for a first attempt! Love the color. I've been working on this project again recently; I should be uploading another instructable for a watch strap that's a bit more refined than this one as well as having my designs available. Watch this space if you're interested
DIY Denim Watch Strap