Wearing white clothes at New Year parties became a traditional custom in Brazil in the 1970s, when members of Candomblé began making their offerings on Copacabana beach. People passing by the beach and watching the ritual found the white clothing beautiful – and have since adopted this tradition too.
However, another (maybe more intriguing!) part of this tradition is to wear colorful underwear underneath the white clothing! Different colors mean different things. People who carry out this tradition chose the color of their underwear depending on what they want the new year to bring for them.
Yellow is believed to bring money and prosperity. Pink brings love. Red inspires passion. Blue brings harmony. Orange is believed to correspond to professional success. Green asks for health. Purple is believed to bring hope for inspiration.
According to nitravelnews.com