Zara a line dress with pockets

Love this dress bought it on posh and it doesnt fit :-( mint, pistachio, sage and hunter greens make up this perfect little dress... elastic in back so will fit a range of sizes. My guess would be anywhere from a 4 to an 8 in womans. Looks brand new no flaws and fabric in perfect condition . pull over dress with pockets. Wide almost boatneck sweetheart neckline. Sort of Bordeaux...makes me sick having to sell it..