Established in 1920 in Portland, Oregon, 2020 marked a century of expertise for DENNIS Uniform. After 100 years, we’ve earned the title of Uniform Experts - we’re celebrating the milestone and keeping the title for the next hundred years. As the largest school uniform provider in the nation, over 2,000 top schools rely on DENNIS to design top-quality school uniforms and deliver best-in-class uniform programs.