Kurtis worn in the summer months are usually made of thin silk or cotton  fabrics; winter season kurtas are made of thicker fabric such as wool  (as in Kashmiri kurtis) or Khadi silk, a thick, coarse, handspun and  handwoven silk that may be mixed with other fibers.Kurtas are typically  fastened with tasseled ties, cloth balls and loops, or buttons.  Ready-made kurtis often avoid the use of horn buttons, in deference to  Hindu sentiments; such buttons are frequently made from cow or buffalo  hooves or horns. Buttons are often wood or plastic. Kurtis worn on  formal occasions .Source








