Entrepreneur Jessica Liao Mayers transformed a $300 investment and a sewing machine into Slate Swim, a successful swimwear brand she sold for seven figures in July 2026. By identifying a gap in the market for minimalist, comfortable swimwear, reinvesting profits, and growing her business without outside funding, Mayers demonstrated how creativity, strategic marketing, and a clear brand identity can turn a small startup into a multimillion-dollar success story.