The Birthday Owl says GUESS HOO IS _______. (You fiThe Birthday Owl says GUESS HOO IS _______. (You fill in the blank with your little one's birthday number (choose from 1-8 in corduroy stripes). Hand-drawn and cut appliques, and custom made to order, this shirt is unique as your birthday boy and a work of wearable art. Chocolate brown with owl in wood-grain print tree and letters. Relaxed fit. Long or Short sleeves. Machine-washable cotton. Made with love in the USA.ll in the blank with your little one's birthday number (choose from 1-8 in corduroy stripes). Hand-drawn and cut appliques, and custom made to order, this shirt is unique as your birthday boy and a work of wearable art. Chocolate brown with owl in wood-grain print tree and letters. Relaxed fit. Long or Short sleeves.Personalized item.   Machine-washable cotton. Made with love in the USA.