A wedding dress with a long train must have a few discreet and well-hidden buttons on the back of the skirt. These buttons are often referred to as bustle, as such is their role. After the ceremony is over and the pictures taken, the bridesmaids will gather up or bustle the train of the dress, using the buttons to keep the swaths of fabric in place. And the bride is now free to move and have some fun at her wedding!