Mustard yellow is a dark, warm, earthy yellow shade that resembles the culinary mustard. It's a versatile color that adds a retro or earthy element to fashion and interior design. In clothing, mustard yellow can offer a pop of color that is more subdued than a bright yellow, making it a popular choice for autumnal palettes. It is often used in accessories and statement pieces to add depth and interest to an outfit. In interiors, it pairs well with a variety of colors and brings a cozy, inviting atmosphere to the space.