One of the Abbasid caliphs, Al-Nasir Ludinullah, was the first to cover the Kaaba with a black cloth. Of course, the cloth was made of silk. Since then, the Kaaba has been covered with a black cloth every year. In fact, this trend has become common since the time of the Abbasid caliph and has continued to this day.
Here, the question comes to mind: why is it necessary to cover the Kaaba with a black cloth?
The reason why the cloth covering the Kaaba is black is that the heat and intensity of the sun's radiation in the land of Arabia are very high, and a hot light shines on the Kaaba. Among all the existing colors, black is more resistant to the sun and it seems that this color is more suitable for covering the Sacred House of Allah.