Mustard yellow is a tricky but often-popular color, particularly in the spring and fall months. While mustard yellow can be difficult for many women to wear close to the face, mustard yellow flats are an easy way to add a stylish pop of color to any outfit. Mustard yellow also coordinates well with several spring trends, such as floral prints or nautical themes. Use them to complement a bright outfit or to add color to a neutral one. Instructions...