But the design is so classic that it's super easy to find without resorting to dropping major cash for the Tom Ford original!
We found two equally affordable options that are super similar to Kate's dress.
Check 'em out ...AFTER THE JUMP!!!
As we mentioned this past summer, Mary-Kate and Ashley Olsen have launched a new business venture, StyleMint.com, a site where members pay a $29.99 monthly fee for a "tailored" shopping experience and to buy fitted tees.
Now in time for Halloween, the ladies are going all out to promote their site, even donning some outfits like Catwoman and Darth Vader.
The 25-year-olds are releasing interactive video quizes online each month and the costumes are for their Halloween special quiz, which if you make it to the end unlocks a special discount code.
Check out more photos of the ladies below and then watch the clip and try to solve it after the jump!
We’re loving this playful side of the Olsens.