Mr. Sol was a mid-20th-century millinery label known for producing fashionable women’s hats, it most active during the 1950s and 1960s. Mr. Sol was one of several "Mr." millinery brands (such as Mr. John or Mr. Song) that dominated department stores and boutiques, providing sophisticated headwear for formal occasions and daytime "mod" looks. Their hats were typically made in the USA, often featuring labels that highlighted their domestic craftsmanship. The brand was well-regarded for its use of fur, particularly mink (ranging from light brown honey to dark chocolate tones) and fox. Hats often featured classic 1960s accents such as satin ribbon bands, bows, and decorative stitching.