How do people dress at la navidad?

If you are referring to the way Christmas is celebrated in Latin America or other Spanish-speaking countries like Mexico, it varies. Some countries blend in folk traditions and dress the way people in the time of Jesus dressed; there are plays and parades, and people act out the various parts of the nativity story. Clothing is colorful, as this is a festive time; red is an especially popular color. On the other hand, if people are going to church (midnight mass especially), they would dress more formally.