My son has a superhero costume that comes with a cape attached to the shirt by velcro. The cape has four corners and is cotton. Is the cape obligated to have tsitis?
Answer:
No, this is not worn for the purpose of a garment, i.e. for protection from the elements. Rather it is for costume play, and hence not considered a arment with regards to the obligation of tzitzis.
Sources:
Orach Chaim SIman10, Biur Halacha s”v Sudar.