Costume Party dream meaning is explained below using 1 different source. Each interpretation is shown with its source.
Interpretation 1 — myjellybean
If you dreamed of attending a costume party, where everyone was in costume except you, this is a warning against false friends.
To dream that you are wearing a costume, signifies that you are putting on a false face toward others. Your true self is not being revealed and you are not being completely honest with people around you.
Source: My Dream Interpretation • Author: myjellybean