I used Sally Hansen - White on as a base, and I took advantage of my many striping polishes... If you don't have striping polish, fine brush and polish would do. I just liked idea of not worrying about brush clean up after every color.
I just did series of uneven lines, and I also left uneven band of white to mimic the real thing, because that would be where fabric was tied. beauty of this design is that you do not need to be tidy, as everything goes. I was entertaining idea of using acetone to blur edges in between colors, but I am glad I did not.