Dreams dictionary: Thong
Dreams dictionary: Interpretation 1
To see or wear a thong in your dream, represents satisfaction with your body image and your sexuality. Alternatively, the dream denotes your readiness to expose or reveal an aspect of yourself that was previously private. You are opening yourself up to others.
Dreams dictionary: Interpretation 2
If your thong is showing from under your pants, then it denotes a lack of respect or taste. You are committing some indiscretion.