Tailor 
To dream of a tailor foreshadows trouble on an upcoming trip. To dream that you are being measured by a tailor is an indication that you will soon argue with someone in your waking life.
Happy
To dream that you are happy is most often a recovery from an actual misery. Perhaps you are trying to run away from actual sadness or anxiety.
Mannequin
To dream of a mannequin implies that you are being too passive about some issue in your life. It is a symbol of your personality or some characteristic. Pay attention to what the mannequin is wearing to search for meaning. Perhaps you are avoiding something that you need to say or do.
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