Yes! Jeans are acceptable year-round – we call it wine country casual (for women — sundresses, blouses and skirts, nice jeans, wedges, sandals, etc.; for men – golf shirts, khaki pants, nice jeans, dressier shorts, stylish sneakers, boat shoes, etc.). A more upscale winery might call for darker denim, and be sure to dress in layers as many winery experiences take place outdoors and tours often take guests through wine caves and chilled cellar areas. What to pack and wear in Napa Valley