White and light blue are the most common colored shirts matched with a gray suit. However, pink, red, French blue, black, green and yellow work well also. Light or dark gray, for a trendy, monochromatic look, are other options.
Because gray, like black and white, is a neutral, any color shirt matches a gray suit. However, different shades of gray work better with some colors than others. Gray is a popular color for suits for both men and women. It is accepted in all business and social environments and is available in a host of shades. Darker grays are more formal than lighter grays.