“Relatable, wearable, and sexy on our own terms.” When St. Louis-based startup founders Lori Coulter and Reshma Chattaram Chamberlin met over lunch in June 2016, they did not immediately envision or even discuss the possibility of starting a company together. Nonetheless, the co-founders launched their eco-friendly designer swimwear brand Summersalt on May 23, 2017, and…