I'm 5'6", 125 lbs, 36C, Breast Whisperer Bra size - Small

Love this bra!  Really keeps the girls from jiggling around when walking and keeps them from shifting during sleep.  Comfortable, but I have to keep pulling down the front for some reason.  And it's tight; I'm OK with that, but if this would make you uncomfortable then this bras isn't right for you.

It's labeled a bra for sleeping because unless you're wearing a T-shirt crew neck that is very high on the neck, it shows.  It's high in the back and the straps sit right at the base of your neck.  The straps doen't lie flat on me, and that's  visible under a top with a thin knit fabric.  If you have nipples that show unless you wear a lightly padded bra, they will definitely show when wearing this bra unless you put an insert in there.