Mategear shines when it comes to really (really!) low cut underwear and swimwear styles. Having missed to order in time for the first three series, I took no chances and ordered immediately on the fourth series. And I was not disappointed: the fabric has a light shine to it. The back is halfway covered, but everything sits firmly, the fit is excellent.
If you happen to already own a "Extremely Sexy Mini Bikini - Shi Woo (Air Nylon Signature Series)": this design features a roomier front pouch, allowing for slightly (but not much) more modesty... ;-)