Elastic Bridal Button loops. One of the classic part of a wedding gown is the row of fabric-covered bridal buttons trailing down the back of the gown. With this elastic loops secured on braided trim you can create this kind bridal gown easily. Just get a big crochet hook handy and start from bottom loop. Pull the button loop with crochet hook and pull it through to button and release it when the elastic is back of to button.