A burqini or burkini is a swimsuit for women designed by Aheda Zanetti (company Ahiida). You can buy them online on Ahiida.com. Many kinds* of burqinis exist: for children, teenagers, adults, plus sizes...
In 2009, a woman in France was prevented from swimming in a public pool because she was wearing a burqini. This interdiction was due to a law that prohibits the use of various forms of swimwear in public pools.
And if you're too hot, you can always opt for micro bikinis on Smallest-bikini.com
*Many kinds: meaning same shape but different colors.