There does not appear to be a scientific name to describe the fear of costumes. Perhaps the fear stems from a fear of 'pretending' or 'being something other than what is' or is true. I, myself, have an aversion to costumes even though my favorite literature, movies, etc. are all of periods in time that include some of the most widely worn costumes. The Rennaisance era and Civil War era are two examples of what I mean. 'Dressing up' for special occasions even feels 'unnatural' to me so I rarely do it except perhaps weddings and funerals. Even then, I wear very little makeup because I do not feel 'myself' if the cosmetics change my natural appearance too drastically.
Personally, my aversion does not bother me. I am happy to be who I am. If your fear should begin to interfere with your happiness, however, please consult with a doctor to help you to address your fear.
The irrational fear is called a phobia; the experience or object that triggers a phobia could be called a phobic experience or object.
the only phobia of the fear of crickets is crickephobia
Bebuphobia...that is the fear or phobia of blueberries.
To have a phobia is to have a fear.
Mud Phobia is the phobia (fear) of mud. Its called mysophobia, myso meaning mud and phobia meaning fear.
Atychiphobia (kakorrhaphiophobia, fear of failure, fear of failing, failure phobia).
Theophobia- the irrational fear of a god or deity. Remember its only a phobia if its an "irrational" fear, a normal healthy fear is not a phobia.
There is no medical term or phobia name for the fear of immigrants.However a similar phobia called Xenophobia is the fear of foreigners.
We use the term phobophobia to name the fear of fear or of phobias. (The word phobia comes from the Greek for fear.)
Hylephobia is the name of the phobia related to the fear of materialism
Ballistophobia is the name of the phobia related to the fear of missiles
Limnophobia is the name of the phobia associated with the fear of lakes