What is the meaning of wearing a wedding dress in your dream?

Dreams do not mean anything. They are random firings of neurons in the brain.

As this is the Dreams and Dream interpretation category, the following answer will address the question.

This particular dream is not predicting any future event, but rather is expressing the dreamer's deep, possibly hidden emotions. The dream combines the symbol of marriage and the traditional white gown with the black dress which is the traditional sign of mourning. This might symbolize nothing more than the end (death) of the bride's former single life. It also carries some sense of loss, which might reflect a fear of losing a sense of one's own self, as the bride (traditionally) takes the groom's name in place of her father's name, and assumes the role of a wife. It could also reflect some doubtful feelings and reluctance.

> Alternatively, "getting married" might also be a metaphor used in the dream to symbolize some other publically recongnized contract or promise. Taking on a mortgage, for example, or signing a partnership contract of any type can appear in dreams as "marriage." In this case, the black dress suggests caution and careful examination of all provisions in the contract.