Instyle.com/ AP

Middleton walked the runway at a University of St. Andrews charity fashion show; Designer Charlotte Todd with the dress she designed.

It’s not exactly worthy of a Victoria’s Secret editorial, but Kate Middleton’s infamous see-through dress is garnering buzz. The transparent piece that the princess-to-be donned at a 2002 charity fashion show at the University of St. Andrews — when she and William were students — will be auctioned off in London next month.

The racy knitted lace dress – which was originally meant to be worn as a skirt — was held accountable for igniting the passion between the two lovebirds, as they started dating exclusively shortly thereafter. (The British tabloids widely reported that Prince William paid for a front-row seat at the show.)

The piece of royal courtship history is expected to sell for more than 8,000 pounds ($12,800) at Kerry Taylor Auctions on Mar. 17. Designer Charlotte Todd, who did not pursue a career in fashion and now works at an aquarium, is honored to have played a part in the couple’s romance.

"If it is true that my design helped change the Prince's interest in Kate from platonic to romantic as has been reported, then I am pleased to have played a part — however minor," said Todd. "I never would have imagined as I sat knitting this piece that one day it would be so important."

The auction will also include two gowns worn by William's mother, the late Princess Diana.

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