hi gem at my first consultation i was advised 525s so booked it.Then 6 weeks later i had lost a stone and a half so thought that 525s were going to be to big so asked for another consultation with my surgeon and he then advised me to have bigger, 700s otherwise i would av empty pockets on the sides so i was glad i went back i think it depends on how much weight you have lost but i dont think they can change the implant size on the day xx