Good Friday is a day of mourning and reflection, commemorating the suffering and death of Jesus Christ on the cross. Some Christians may choose to dress in a way that reflects the somber nature of the occasion, such as by wearing black, dark colors, or simple clothing. However, no universal rule or requirement dictates what colors should or should not be worn on Good Friday.
The decision to wear certain colors on Good Friday, like any other day, is personal and should be based on individual preferences and circumstances. It is important to remember that outward appearance, including what we wear, is not as important as the condition of our hearts and how we treat others.