What does it mean to dream with a red dress turning white?

The significance of this dream might well be different to different individuals in different cultures. In the West, red dresses tend to be regarded as sexy or, in the extreme, sinful, suggesting a loose, fallen or wanton woman. In contrast, a white dress represents purity and is associated with the traditional white bridal gown.

.... These associations echo passages from the Christian Scriptures in which a stained or polluted garment is made "white as snow" by the grace of Christ. The metaphor describes the removal of all sin and guilt and restoration of innocence.

.... In the context of these traditions, the dream suggests a transformation from a life of sin to a life of innocence.