Manchester United have worn red shirts white shorts and black socks since 1928. There is a myth that the black socks were a tribute to the Munich disaster in 1958 but it's not true.
The kit is sometimes changed to avoid clashing with the opposing teams colours. The basic rule is that the home team plays in it's preferred kit and the away team changes anything that might make decisions for the officials difficult, sometimes that may be the shirts, the shorts, or just the socks.
Most teams nowadays have at least two 'away' kits that are designed to avoid clashes with other teams colours. The match officials have the final say in what each team can wear.
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The Colours of Manchester United's Home Kit are Red-White and Black. Red Shirt, White Shorts and Black Socks.
Black or a faded black
unlock bigheadmode and then type in black socks
They wear a shirt, tie, waistcoat, trousers, black socks and special dancing shoes.
Grey tunic, white shirt, black tie, black socks and black leather slippers according to a site about his final day.