i was pretty big, dont know the size since i never really wore bras but lets just say it was impressive on such a skinny guy
the ONLY thing i felt good in was underworks. they wear out, which would be why yours stopped working, and when that would happen to me id buy a new one and it would be good for another year. i never tried many things though since binders can get pretty pricey, but price effective and binding effective underworks is where its at.