Here's a video showing how to make a simple beaded anklet.
It's a pretty cool earthy anklet and it costs very little in materials. Perfect for days at the beach, summer bonfire nights, and lazy cottage lie-abouts.
Hemp is often classified by strength rather than diameter. "20 lb. test" is understood to be approx. 0.82-1.0 mm diameter, so if you see 20 lb test, you are in business :)
Hemp twine and wooden beads can be found at just about any hobby and crafts store, as well as dedicated jewelry suppliers.
Here are some supplies/ suppliers I recommend: