It's fantastic that you're looking to switch things up. For a more refined yet casual look, consider layering. A well-fitted blazer over a basic tee can elevate the entire outfit. Invest in versatile pieces like chinos, polo shirts, and loafers. Brands like Everlane, Uniqlo, and Patagonia are not only trendy but also focus on sustainability. Remember, sometimes less is more, and it's about mixing and matching the right pieces.