- Your little one will be comfy and cute as can be on their first Halloween with the adorable design of this Plush Unicorn Halloween Costume Vest from Hyde & EEK! Boutique. This vest Halloween costume features an allover plush white fabric with a pastel purple patch on the chest and adorable little wing accents at the back with beautiful glittery purple accents. Complete with a vibrant multicolored pastel mane and tail, cute ears and a swirly horn, this hooded unicorn costume is the perfect pick