Happy National Bikini Day. In honor July 6, 2014December 12, 2018 | by Rebekah Steen Happy National Bikini Day. In honor of this monumental day, 1: Please note that every body is a bikini body, and 2: Here is one of my favorite kind of bikinis: the stay put, soft, sporty, chic, basic black kind. Bikini by Kore. Je l’aime.