Essence of Australia D1897 wedding dress

This is a white sample dress I bought about 2 years ago in anticipation for our wedding. We are going in a different direction so I need a different dress. It was bought from a boutique that closed and I was told it is a size 6 sample so it should be able to be altered up or down a couple of sizes. It has been in my closet for the last two years. This style is not being sold anymore.