Sara Blakely.

Blakely grew up in Clearwater, Florida, planned to follow her father into law, and twice bombed the LSAT. She took a job at Walt Disney World, where she was two inches too short to play Goofy and ended up buckling guests into the World of Motion ride at Epcot. She moved to Danka, an office-equipment company, and spent seven years selling fax machines door-to-door across Florida, having her business card ripped up at least once a week. One night in 1998, getting ready for a party in white pants, she cut the feet off a pair of control-top pantyhose with scissors and realised she had a product. She saved $5,000 from her Danka commissions, bought a textbook on patents at Barnes & Noble, and drafted the application herself to avoid the $3,000-$5,000 lawyers were quoting her. Spanx shipped from her Atlanta apartment in 2000.

Every hosiery mill in North Carolina turned her down. She drove up with sample sketches drawn on legal pads and heard the same reply from mill owners: it is a terrible idea, pantyhose are already comfortable, go home. One of them, Highland Mills, called her two weeks later; the owner's daughters had told him he was wrong. She had no manufacturing contacts, no retail buyers in her phone, no investors and no fashion training. She was still selling fax machines by day while sourcing fabric and designing packaging at night. She picked the name Spanx herself because research told her made-up words with a hard K sound sell. She designed the red-and-white packaging on her apartment floor because the hosiery aisle was a sea of beige. For almost three years she was the only full-time employee, taking the calls, packing the boxes and writing the cheques.

In 2000 Blakely cold-called the Neiman Marcus buyer, flew to Dallas, and in the middle of the pitch took the buyer into the women's restroom to show her the before-and-after in a pair of cream trousers. Neiman Marcus placed Spanx in seven stores. She mailed a basket of product to Oprah Winfrey's stylist Andre Walker with a handwritten note; in November 2000 Oprah named Spanx one of her Favorite Things on national television. Spanx hit $4 million in revenue in year one, $10 million in year two, and stayed debt-free, ad-free and 100% founder-owned for two decades. Forbes crowned her the youngest self-made female billionaire in 2012. In 2021 Blackstone bought a majority stake at a $1.2 billion valuation, and Blakely handed out two first-class plane tickets and $10,000 in cash to every one of her employees.

Blakely's story is the clearest case in modern consumer goods for the value of being a domain outsider. Every hosiery insider she met told her the category was finished; she saw it with the eyes of a woman who had to get dressed that morning and could not find what she wanted. Not knowing the rules let her break them: she wrote her own patent, picked a punchy made-up name instead of a feminine one, used red packaging in a beige aisle, and sold a bodywear product by making buyers wear it. She also stayed close to the customer long after she could have delegated — the first few years of Spanx was essentially one woman answering her own phone. The lesson is not that ignorance is an advantage. It is that fresh eyes, applied with relentless follow-through and a willingness to look stupid in front of mill owners and department-store buyers, can beat decades of category expertise.