Im obsessed with this dress too! I 1st ordered the black/green long sleeve one & it fits amazing. Im 58 150 lbs and big busted, I ordered the M cause I usually wear an 8 and it fit perfectly! Its not low cut at all and Im a modest dresser. You don't need to wear a slip or anything underneath, just iron the fabric behind the buttons when you wear it so they lay flat and cover the button area. This dress can be dresses up or wore casually. Its so perfect, I got a blue shirt sleeve one and am tempted to buy other colors!