Penelope Tiered Sleeveless Jacquard Gown

I ordered this dress in both a small and medium. I am a size 4 and I could not zip the zipper all the way up on the back on the size small. The medium fit perfectly. Let me just say that the dress is beautiful and flattering. The thing I did not like about the dress is that it wrinkles easily because of the material. When I took the dress out if the plastic bag it was shoved in, one of the tiers was so wrinkled that it protruded out and looked awkward. Not sure if you can iron this dress or not but the last time I used an iron was 20 years ago. This is the reason sadly returned it.