Wearing dark or black clothes at a funeral is a common cultural practice in the Western world and is considered a sign of respect. According to some sources the tradition actually dates back to ancient Rome, where mourners would adopt a darker toga to signal their mourning. 

As the Roman Empire spread out across Europe, this tradition spread with them and other cultures coming in contact with them started adopting dark or black clothing at funerals. The tradition of wearing black mourning clothing continued through the Middle Ages in Europe, and traveled to the Americas with early American settlers.
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