If you wore the corset in a dream, then it shows the feminine aspects of your personality. Perhaps you wish to show the best part of yourself. The corset could also indicate the limitations you are suffering from. Perhaps there are things that you feel uncomfortable with and wish to remove for the sake of acting normally.

…Dreaming of a corset, denotes that you will be perplexed as to the meaning of attentions won by you. If a young woman is vexed over undoing or fastening her corset, she will be strongly inclined to quarrel with her friends under slight provocations….

(See Brace)

Seeing it worn by a man indicates requirements imposed by your environment. Worn by a woman, risk of marital disputes.

…(Corset | Jerkin | Knee brace | Support) In a dream, a brace signifies tight circumstances, difficulties, adversities, pain, sufferings, weakness and need for someone’s support. A brace in a dream also may denote resoluteness and determination. If one sees himself using a brace with a support device in a dream, it means fulfilling one’s purpose, wantonness, containing one’s needs or satisfying them….