Floral cotton corset style sun dress

So darling! Cotton corset front style sun dress. Pink flowers with mint leaves and background is super fine black and whiye pinstripes up close but looks pretty solid from a distance. Stretch cotton. Size medium. I bought and love this but it doesn't fit me! :( I would say this is a true size 6 but would easily fit an 8 assuming bust is D or less. I am a 6-8 and it fits fine but I am busty (DDD) so it didn't look good in my chest area.