I am loving this multi-tonal, sparkly, sheer scarf that I recently found!  To achieve the braid at the back, I put on the white scarf first, then the black over, and then blue one on top.  All the scarves had one end short and one end long.  Once they were all tied back, I braided the longer ones and brought them over the bun, securing them with an elastic to the shorter ends.  Then I covered the elastic with a pretty flower pin!