They are all showing their support for breast cancer awareness by wearing Blossom's clothes (It was her idea, anyway).
Also, they decided to wear a bikini top under their dresses with some soft material under the bikini top to make them look grown up - I've seen a breast cancer awareness campaign where young girls were doing it to make themselves look grown up!
Bubbles and Buttercup might be called Blossom by mistake at first, because they are wearing Blossom's clothes.
I wonder what their villans think of them like that...
Their most important message is "If you find a change in your breasts, please see a doctor" - they would be great to be included in a PSA!