Things you'll need:
1. i have no idea how it's called, but you can see it in the photo. you shoul buy it in 3 shades of a color, i had 3 blue tones, but third one was all gone.
buy 1 meter of the light one, 2 meters of middle tone and 1,5 meter of the darkest one.
ok, let's just call it nice elastic band. (it MUST be elastic!)
3. some lace. in the picture it's not blue, because my blue is gone, but I think you should keep your swimsuit in one color, it's already detailed enough.
4.nice, shiny ribbon in matching shade
6. threads matching to all of the colors used
and an old bikini of course ;) push-up looks good on small breast like mine ;)