The see-through dress that allegedly sparked the royal romance of the century has sold for 78,000 pounds sterling, or $125,000, at the Kerry Taylor Auctions Passion for Fashion sale.

Princess-to-be Kate Middleton wore this dress in a 2002 St. Andrews University fashion show. The dress was designed by Charlotte Todd and cost less than $50 to make.

The lingerie-style dress was originally intended to be a skirt. The 31-year-old designer told that her assignment was called 'The Art of Seduction,' which is quite apt, really. I didn't know who Kate Middleton was and I didn't put her in it. It was just pure chance.

Todd said she has never met Middleton but is excited she played even a small part in her eventual engagement to Prince William.

I'm thrilled. Everyone says that the fashion show was when the romance started and when she bagged her prince, so a small part of me will always be part of royal history. It's madness! she said.

Here is a look at the dress: