Most maternity wedding dresses use stretch fabrics designed to accommodate your ever-changing body. A number of maternity wedding dresses have empire waistlines with softly flowing fabric designed to fit loosely around the midsection to fit your growing belly. There are also some maternity wedding dresses made from stretchy materials like spandex, but if you're looking for something a little more elegant, you may opt for silk, satin or stretchy lace maternity wedding dresses.