The dress is unworn. It has been altered (the sides have been slightly taken in, and it was hemmed to work with 5'8". A bustle has also been added, and a few layers of tulle have been removed. It didn't change the shape of the dress much, but made it lighter and not as hot. See measurements above.
It is only two months old (delivered the beginning of June) and has been steamed and kept in a bag.