I started doing some research into the colors of hats commonly available, mostly to determine what colored suits a hat might go well with. As I looked more into hats and their colors I also started to look into the different connotations of colors. This is just a quick guide to the information that I have compiled from a few sources. Brown Brown, because it is the color of dirt, is often seen as wholesome or earthly. Because of this natural feel to the color, it can als be regarded as simple and steadfast. Some people consider this to be a dull color as a result of simplicity. Brown, depending on its shade, goes with just about anything. It is particularly well complimented by green (possibly through their mutual connection to nature). Black Black is an ominous color that is usually associated with death. Itis also a fairly commonly used color to represent simplicity or something stylishly new. The contrast of black against most other colors, because it is not a naturally occuring color, sends a message. Black can also come to symbolize evil, but remains a fairly popular color. Black can also go with viruatlly everything else, even moreso that brown. It has a powerful effect when used to contrast against a particularly light color. Gray Gray takes the middle ground between black and white, good and evil. It can represent security and stability, as well as an ability to compromise. It can be considered a bland or depressing color at times as well though, especially when associated with dark clouds. Grays neutrality allows it to go with most other colors, but some people argue that it doesn't look good with blues and greens. Once again, this is mostly an issue of shading with the lighter grays being more versatile and only the darkest shades being restricted on what might look good. White White represents purity, neutrality, and sterility (cleanliness). White is a neutral color, and also a color representing good. White is another neutral color, and is therefore able to go with most other colors. Like black, it can be used to create contrast, but with dark colors as opposed to light ones. Green Green is a color of nature that produces a calming or soothing effect. Green, through its association with the spring time, can also channel a feeling of renewal or rebirth and youth. Negative connotations, however, have green representing envy. Browns and greens are mutually beneficial colors - so, as a brown hat goes well with a greent suit, a green suit goes well with a brown hat. Greens clash with blues though, and I am personally not too fond of the greens with grays either. Blue Blue is a color of confidence, stability and security. Unlike black, however, blue is considered to be a non-threatening color of power. Despite the soothing effecs of blue, and the non-threatening power associated with it, blue is also a color that channels depression. I haven't seen too many hats in blue, but a navy blue might be an alternative to black in some cases... The biggest problem with blues seem to be that, when worn with a blue suit, the tones must match up or something will always look off. Similarly, it must be a suitably dark shade of blue to go with other colors. I tried to hit the main colors with this, but there will always be variations of these and more obscure colors - feel free to chime in.