Many thanks to Madeleine Nilsson whom has shared her Sunkini experience with us. This is what Madeleine wrote:
Today it is 11 degrees here so my bikini won't be used today ;-)
It dries amazingly quick after usage, very nice to not get any wet towels :-)
I have no visible marks from my bikini top!
Under the panties my tan is about two nuances lighter (see picture), i have never gotten that tanned on a sun vacation before.
To me the tan lines on the chest that i get from usual bikinis is what anoys me most, and this problem Sunkini has solved to 99% for me! I am superhappy and will definately order more Sunkinis!