I ordered a Medium. I am 5'4, 140 lbs, 36 D and 4 months postpartum. This is the first thing I have felt beautiful in since my baby was born!
Being pp, nothing fits right anymore. I have a extra 15 lbs and doubles bra size than before so I really wanted house dress that was comfortable, I could breastfeed in and feel beautiful and wear outside the home to a quick errand (SAHM here).
This dress is extremely comfortable and flattering. It hides my mommy belly while still accentuating I have a waist. It hits at my ankle, I can walk without stepping on it at all which is hard to come by when you're 5'4!!
My only slight dissatisfaction is with the arms. The cuff where it buttons is a tad tight. It isn't restrictive by any means but it would be nice if it were a little looser. Certainly not any reason to not buy it in my opinion. But if your arms are larger, I might size up or else the cuff probably wouldnt button.
All in all, I am very happy with this dress!