There are dark shades, like a mustard yellow prom dress, and lighter and pale ones - which can be hard to tell apart. While they can look similar, pastel yellow prom dresses still differ from pale yellow or light yellow prom dress shades. Pale yellow long prom dresses, for example, appear soft or muted; the color is not intense. Pastel yellow prom dresses are still pale, but some of these shades are brighter than others. For more information, feel free to contact PromDressShop.com.