Personalized Lucky Unicorn Toddler Dress. Cute St. Patrick's Day Toddler Dress - Mauve with Speckles with magical, green Irish unicorn and shamrocks says LUCKY. Luck O' The Irish unicorn lover novelty gift for parades and Irish St. Paddy's Day parties. Your little one will be adorable and comfortable in this 100% combed ringspun cotton 1x1 baby rib dress!