NWT White Satin Diamanté Blazer Dress (6 but fits like a 2)

Purchased this fabulous blazer dress from Pretty Little Thing for an event, but never got the chance to wear it. It came missing the fabric on the second button, but I didn’t return since it came with an extra button (as seen in video). I would recommend fashion tape for the boobs and maybe shorts underneath. Would be PERFECT for a concert. For reference, I am 5’6” 25” waist, 32D, and around 127 lbs. This dress is a size 6 but fits like a true size 2 (which I am).