MLB Houston Astros '47 Brand Clean Up Adjustable Cap-2013 Road Style, One Size, Navy : Sports Fan Baseball Caps : Sports & Outdoors

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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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MLB Houston Astros '47 Brand Clean Up Adjustable Cap-2013 Road Style, One Size, Navy : Sports Fan Baseball Caps : Sports & Outdoors

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Houston Astros Champions 47 Brand Orange Clean Up Adjustable Hat