Sew Kansas: Corset Back Dress. This is a nice tutorial on how to alter a dress by adding corseting. As the pinner says, adds a few precious inches where needed. I did something similar to my wedding dress for my daughter.
24 Most Refined And Visually Stimulating Steampunk Women Dresses
Victorian Steampunk Black Satin Corset with White & Black Bustle Skirt: corset is boned with steel boning. Has front busks (opening) and back lacing with 20 grommets. Skirt is taffeta Victorian damask black and white bustle skirt.
Sewing My Wedding Gown, Part Three: Making a Corset Back