French Blue is a classic color that has been associated with French fashion and style for centuries. It is a shade of blue that is deep enough to be both elegant and sophisticated. Sometimes referred to as "navy blue," French blue can also be described as "royal blue" or "cobalt blue." Other synonyms that might come in handy when describing the color include "midnight blue," "sapphire blue," "indigo," and "denim." These shades all have different levels of darkness and undertones, but they are all variations on the same theme. Whether you're designing a new piece of clothing, decorating a room, or just trying to describe a color accurately, these synonyms will help you capture the essence of French blue.