Field Day is an American sustainable fashion brand founded in 2005 by designer Trinity Cross with a vision to create timeless clothing that blends classic style, everyday comfort, and responsible craftsmanship. Rather than following fleeting trends, Field Day is dedicated to designing garments that stand the test of time—beautifully made from consciously sourced materials and created to become lasting wardrobe staples.

Every Field Day piece is designed, cut, sewn, dyed, and finished in Oakland, California, using recycled and locally sourced fabrics whenever possible. By partnering with the same small, women-owned manufacturing studio since the beginning, the brand ensures exceptional craftsmanship while supporting local production and sustainable manufacturing practices. Each design is thoughtfully created to flatter the body, provide breathable comfort, and allow effortless movement. Practical details, such as functional pockets on dresses, reflect the brand's belief that beautiful clothing should also be highly wearable.

In 2013, Field Day opened its first flagship store, Field Day and Friends, in Oakland. The boutique showcases the complete Field Day collection alongside a carefully curated selection of locally made sustainable goods, handcrafted accessories, herbal remedies, and unique gifts from independent American makers. The store embodies the brand's commitment to conscious living, craftsmanship, and supporting small businesses.

In 2020, Field Day relocated to the foothills of Northern California while continuing to manufacture every garment in Oakland with the same trusted women-owned factory. Guided by the philosophy of creating fewer, better pieces, Field Day remains committed to producing clothing that is timeless, responsibly made, and designed for modern women who value quality, comfort, and sustainability.