When the days get colder, it can be easy to slip into a color palette of dark hues just as gloomy as the weather outside. But why not use your wardrobe to inject some sunshine into your life. Take it from Gigi Hadid, Adwoa Aboah, and a slew of other top models who have traded in the model off-duty uniform of all-black for bright yellow. This week, Hadid celebrated the launch of her new Maybelline collaboration in London wearing a traffic light yellow Ralph Lauren minidress and matching trench coat. Her model peers have also adopted the trend, opting for cool t-shirts and sweatshirts for their casual looks. Ready to take the colorful plunge? Click through for some model-approved color inspiration.