Twilight Sparkle in a bikini. Why is she wearing a bikini top on her chest? Well, it looks adorable, it keeps her chest fur from getting wet and sandy, and I figured, since ponies have humanlike arms and torsos, it would make sense for them to have human chest muscles, and for mares, breast tissue. But to compromise, their chests lack mammary glands, and the breast tissue adds up to a 32AA or at most 32A, so the chest stays small. With the exception of Milky Way, they don’t need a second top, because their crotchtits are in the bikini panties.
 
AND YES, SHE IS AN ALICORN HERE. DEAL WITH IT.