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What are some standard matching 'rules' I should consider when choosing which cap to wear? I have baseball caps in all the basic colors, white, black, navy blue, and grey (no logos).

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St. Louis Cardinals 2009 All Star Game New Era 59Fifty Fitted Hat in Light Blue, Maroon and Khaki Under Brim.

St. Louis Cardinals 2009 All Star Game New Era 59Fifty Fitted Hat (Light Blue Maroon Khaki Under Brim)

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New Era Black Yellow Grey Bottom Pittsburgh Pirates 1959 All Star Game Fitted Hat – Exclusive Fitted Inc.