Grab your sunscreen—it’s National Bikini Day this July 5, and it’s the perfect opportunity to head to the beach. National Bikini Day celebrates the anniversary of the invention of the two-piece bathing suit. Due to its risqué design, the bikini was slow to be adopted—but it gradually gained traction when film stars like Ava Gardner and Brigitte Bardot started to wear bikinis on public beaches and in their films. It’s certainly one of the greatest inventions of all time, even though its beginning wasn’t quite explosive. (Ironic, because it’s named after hydrogen bomb testing that was conducted at Bikini Atoll in the South Pacific during World War II.) Get ready to celebrate this summer icon with us!