Hats to Make Your Head Spin Alternative Design Studio, also known as ADS Hats, is a hat store/design studio located in the colorful and vibrant Mission district of San Francisco. The studio/store was established in the Mission in 1994. The store is in it’s third location in 15 years. Elina Tachkova Davenport is the Milliner for the store. ADS hats carries unique and stylish hats by local designers and famous brands.