Protecting, obscuring, or disguising whatever is represented by the body part the scarf is covering.
Your perception of the wearer (such as their self-expression, characteristic, mood, etc.).
Perceived femininity or masculinity.
For more clues, consider the context of the scarf (such as who was wearing it and which body part it covered), its role in the dream, and how you felt about it.
See Tie, Clothes, Decoration, Cover