Ladies may think about wearing layers, over individual pieces. Being relaxed but still stylish, and layering allows you to feel comfortable but still mix and match unique styles. A pair of boyfriend or skinny jeans, well-fitted cotton-blend T-shirts, and a white or chambray button-down shirt is sufficiently casual and pulled together for your day in the Napa Valley.
Men may wish to sport a tailored shirt and khakis or simple relaxed, dark jeans are appropriate.
Ladies can feel gala ready with their take on a tea- or floor-length gown. Jewel tones and icy pastels can be just as refined in simple silhouettes. Feel free to splash out in dressy separates too—say, brocade cigarette pants topped with a beaded shell. Whichever you choose, fancy footwear is a plus. Be sure to bring a wrap or light jacket, as the temperatures chill quite a bit after dark.
Men go for dashing and timeless. Classy, sleek and statement making in a suit. Black tie is always optional.