Revelers at West Indian American Carnival Day fly the flags of Jamaica, Barbados and other Caribbean nations, dance to booming calypso, soca and reggae music and taste fragrant dishes such as jerk chicken wings, aloo pie and oxtail stew. “Playing mas,” or masquerade, is a linchpin of the euphoric celebration of Caribbean culture that will take over Eastern Parkway in Crown Heights. The skin-baring, brilliantly colored costumes often include tall feathered headdresses, sequined shorts and wings or other accessories. The march is in its 48th year and is expected to draw as many as 2 million people.