I tried this wonderful pattern about 5 years ago and I used Silamide thread, which I really like using. It called for the thread to be doubled, but I find it so annoying so I didn't....big mistake, the bangle kept breaking the thread as I made it and eventually it all fell apart!!! In a shopping centre with beads flying everywhere!!!
I wanted to give it another go with a nicer blue bead colour too, so i started another using Fireline. It has worked wonderfully and I did not have to double it :)