6. Marilyn Monroe’s “Happy Birthday” dress – $1.3 Million
It is the 6th most expensive dress on our list and the 1st expensive dress to cost more than one million dollars. This dress was designed in 1961 by Jean-Louis Berthaulto who is an American fashion designer. It was especially created for Marilyn Monroe to attend the birthday party of the President John F. Kennedy. The dress is decorated with sequins that sparkle like diamonds. The original price of this dress is $12,000, but it was sold at an auction for $1.3 million.