I had a look at these the other day at Target. The target brand ones were around $20-30 and they also had another brand that was closer to $50. maybe go into target and try one on and if you can get it cheaper on ebay at least you will know what size!! They had one that was like underwear that went up to under your bra and one that was like bike shorts to pull in your bum as well. I also thought they would be good to cover your tummy when you need to pull your top up to BF!!