To dream of buying a thong, symbolizes your hidden attempt to buy the attention of others.
To dream that people can see your thong, signifies a situation that has created a loss of respect for you.
Alternatively, it symbolizes some aspect of yourself that is private.
If you feel ashamed of being seen in your thong, then it indicates your hesitance in revealing your true feelings and attitudes.
To dream of seeing someone else in their thong, signifies an embarrassing and inexplicable situation.
Alternatively, you may see that person for who she really is.
To see a dirty or torn thong, suggests that you are not comfortable in your own skin and have feelings of insecurity.