medium?

the dress im wearing today is a medium and it didnt come from new york and co. (a store i always have had to go down a size in). i tried it on in the store and i was like "i bet if i had on a real bra and not a sports bra, it would fit right and look cute". AND i was right! i bet having just dont 2 miles on the treadmill and not having eaten anything helps, too. i cant get too excited, though. it is a cotton babydoll dress and things of that nature tend to be forgiving. i am glad to be wearing it even if no other medium dress i come across fits.