Nookie Penelope one shoulder dress gown blush; fits like a 6

I am a true size 4 and this dress is a large so it definitely runs small. That's why I put medium as the size even though the tag says large Blush Nookie Penelope gown. New without tags, because I ended up wearing something else. I only put it on for the photos Pretty bodycon dress with slit up the back. I am 5'5 wearing 3 inch heels in the picture and the dress is long One shoulder gown with elastic shoulder strap. Made from form fitting scuba crepe with invisible zipper at back