Hello! For this event, white is the correct color with an optional white headband. Blue does not really fit this occasion. White is for people who mourn the dead and worship their ancestors, and the Daoists usually dress in white during this event. White also shows the purity in one’s spirit, but it would mean worshipping ancestors for this event. The robe definitely has to be white, shoes and pants can be optional what color you find best. If you only have a blue uniform, you can get a white overcoat and white headband, and it fits also.