I believe you are refering to people who follow the “Sikh” reliegon in India. The reason for wearing the head covering is to cover their long hair. Sikh men grow long hair and take a vow not to cut it to honor their guru (master) who had won freedom for them and taught the Sikh way of life. I am not Sikh but am still taking the liberty to answer this question based solely on my knowledge from Sikh friends I had in the past.
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Name : Abhinav, Gender : M, Sexual Orientation : Straight, Race : Asian, Religion : Hindu, Age : 25, City : Troy, State : NY, Country : United States, Occupation : Manager, Education level : Over 4 Years of College, Social class : Upper class,