To dream of a decorative pin represents something about yourself that you feel is important to be noticed by others. It may also reflect something about yourself that you are choosing to be noticed by others because it benefits you or makes others feel good about you.
Negatively, a decorative pin may reflect feelings about your lifestyle or your poor choices are on display for others.
Example: A man dreamed of having forcefully and repeatedly stuck to his feet. In waking life he felt forced to keep making people notice how serious his need for assistance was because of the homelessness he kept experienced. The pin reflected his poor choices or bad luck that resulted in homelessness that he felt was continually on display to others.