Just confirming Sainfox's words on FKK beaches and places. Once you are used to it, you do not want anything else.

Moving back to topic: Most meshes, including Antonia's are built with a breast shape as if supported by a bra. That is convenient because otherwise clothing would not fit. For topless renders or renders featuring light 'nightgown' type clothing, breast shapes usually shoud be corrected to take more account of the effects of gravity and, for poses in motion, inertia.