I bought the hooks and latches from a hardware store you can pretty much get them anywhere you just have to look really hard. You can also get them at extreme sports stores. Or you could do what i did the first time I ever made one take a store bought collar and cut the latch and hook off the ends lol.
The hemp you can by pretty much anywhere as long as they have a craft section. It comes in large balls just like yarn and in the same place there are usually the nice big beads there as well.
There really easy to make or i can even make and send them.
You can also have different colors then just tan theres blacks, grays, rainbow, black and white mixed, and tan and white mixed.