Closet Tits
a woman who has really nice, large breasts but for some reason always chooses to hide them. She can often be seen wearing loose fitting over-sized clothing. Only on the rarest of occasions can you see her true form. This could be the result of embarassment from pre-mature physical developement.
I didnt realize Jennifer had closet tits until she got drunk and took her loose sweater off, revealing very large breasts.