The 11-week-old prince, who is fifth in line to the throne, will be baptised at the Chapel Royal at St James' Palace in London on Monday.
George was also christened in the Chapel Royal, but Charlotte was baptised at the Church of St Mary Magdalene in Sandringham. The intricate, cream-coloured lace gown is a replica of the one worn by Queen Victoria and Prince Albert's eldest daughter, Victoria, during her baptism.
Meghan was christened and confirmed by the archbishop in the same chapel in March.
His father said he had "thrice the worry now" when he left hospital with Kate to take the infant home to Kensington Palace.
Kate Middleton and Prince William have announced all the details surrounding their third child's christening, from the date to the location.
"Sleeping's going reasonably well so far, so he's behaving himself, which is good", he added.
Louis is the Queen and Duke of Edinburgh's sixth great-grandchild.
But most of the buzz surrounding the event has to do with who will be named as Louis' godparents.
The Royal Family expects large crowds outside the baby's christening as many people attempt to catch a glimpse of the little prince and the family of five for the very first time on such a special occasion.
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The rhino horn, in particular, is believed to have healing and aphrodisiac qualities in parts of Vietnam , China and elsewhere. Due to its prominence and collection of animals, the park has faced multiple break-ins by poachers in recent years.