Dennis is the archetypal badly behaved schoolboy and your little one can now become their favourite book character with our fantastic costume. It features the infamous Dennis red and black stripe top which has yucky splodges of food amongst other things printed on the front. It also comes with matching black shorts, a mask and a hilarious whoopie cushion to really bring the costume to life. - Perfect for World Book Day, see our full selection of imaginative costumes to leave them feeling inspired. Please note that for dress up styles under 3 years the appearance and features may vary due to safety reasons. Bringing books to life.