I am a huge fan of black and so I wear it all the time - even in the summer. That's why I understand women who put on black swimsuits even if it's like 40C outside. It just looks so sexy even if you're melting underneath of it and matches high heels so well. Some propositions from the runways:

Celine, Gucci, Diane von Furstenberg, Adidas by Stella Mccartney
And from various on-line stores:

Oli, Oli, Melissa Odebash

Elizabeth Hurley, Elizabeth Hurley, Anna & Boy

American Eagle, Aeropostale, American Eagle
And from Urban Outfitters:

Billabong, Betsey Johnson, Damsel

Lux, Lux, Salinas
But if you're sure, you won't be using your swimsuit for actual swimming, but to impress the others, Dsquared2 is definitely a brand you should look at.
