Which Italian New Year's Eve tradition uses red clothing as a symbol of good luck?

Wearing red underwear is an Italian New Year's Eve tradition associated with good luck.

In Italy, red clothing—especially red underwear—is commonly linked with prosperity, love, fertility, and protection from misfortune during the coming year. The custom is often treated playfully, with stores promoting red garments in the weeks before December 31.

One explanation connects the color red with ancient Roman celebrations, when red was associated with power and vitality. The modern underwear custom is newer and has been strengthened by commercial fashion and popular culture, so its exact origin is not certain.

Practices vary by region and family, and the tradition is not a religious requirement. It is also distinct from Italy's food customs, such as eating lentils, which are associated with coins and financial prosperity because of their shape.