In the USA, several brands are renowned for their quality and style when it comes to polo shirts. Here are some notable Polo Shirt Brands in the USA:

1. Ralph Lauren: Perhaps one of the most iconic polo shirt brands, Ralph Lauren is known for its classic and preppy designs. The brand's polo shirts often feature the distinctive polo player logo and are available in various colors and fits.
2. Tommy Hilfiger: Tommy Hilfiger offers a wide range of clothing, including stylish and comfortable polo shirts. Known for their signature red, white, and blue logo, Tommy Hilfiger polo shirts often reflect a classic American aesthetic.
3. Lacoste: Lacoste is a French brand with a strong presence in the American market. Renowned for its crocodile logo, Lacoste polo shirts are recognized for their high-quality materials and timeless design.
4. Brooks Brothers: As one of the oldest clothing brands in the United States, Brooks Brothers is synonymous with classic American style. Their polo shirts often feature traditional designs and quality craftsmanship.
5. Nike: While primarily known for athletic wear, Nike offers a variety of polo shirts that combine comfort and performance. These are popular not only for sports but also for casual wear.
6. Under Armour: Another sportswear giant, Under Armour, provides polo shirts with moisture-wicking technology and performance-oriented designs. These are favored by those looking for a blend of style and functionality.

These brands offer a range of options in terms of style, fit, and price points, making it easy for consumers to find polo shirts that suit their preferences. Keep in mind that the popularity and availability of specific brands may vary over time.