It was a basic convention of comic books at the time of Batman's creation that black needed a highlight color (usually blue) in order to show detail and give the illusion of three-dimensionality. Over time, the initial blue highlight spread out over the previously black cape and cowl to become the dominant color. Thus artists renditions depict the costume as black and gray or blue and gray.
The practice may have originated in a Celtic festival, held on 31 October–1 November, to mark the beginning of winter. It was called Samhain in Ireland, Scotland and the Isle of Man, and Calan Gaeaf in Wales, Cornwall and Brittany. The festival is believed to have pre-Christian roots. After the Christianization of Ireland in the 5th century, some of these customs may have been retained in the Christian observance of All Hallows' Eve in that region—which continued to be called Samhain/Calan Gaeaf—blending the traditions of their ancestors with Christian ones.[2][3] It was seen as a liminal time, when the spirits or fairies (the Aos Sí), and the souls of the dead, could more easily come into our world.[4] It was believed that the Aos Sí needed to be propitiated to ensure that the people and their livestock survived the winter.
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