This lightweight dress is lovely! I usually wear a size 16 and an XL fits me very well (would probably also fit an 18 but would be too big for a 14). After warm water washing and drip-drying, it maintained it's sizing. I may iron it but it may just be fine as is!
I have two pairs of these pajamas and I love them! They are the perfect weight to sleep in. They wash and wear extremely well and are so soft. I hope he comes out with a third pattern !