You must know that we need more heat because of the cold in winter.
Black absorbs more sunlight so when you stand up wearing black clothes or a sweater, it heats up quickly because black color more absorbs heat. And gives us heat. So that black clothes are more convenient to wear in winter.
This is the reason why people avoid wearing black clothes in the summer.
You may have noticed that the buffalo stays in the water for a long time during the day and the reason is that its skin is black and the black color absorbs more heat. This is more seen in summer.