Essense of Australia D1275 Corset unclassified dresses

This dress was originally a size 22 but altered down to a size 18-20 (corset back allows flexibility). The seamstess left the material in the inseam, so it can be let out.  I bought the dress new from a salon listing on preownedweddingdress.com and never wore it (besides trying it on for alterations) because the wedding was called off.