Any other fans of the Isaac Mizrahi cable show from back in the day? Remember when he would give fashion advice to an audience member and hand over a freshly drawn sketch of how to wear a particular article of clothing?
Unless you have friends in way higher places than we do, you're probably not going to get Isaac (or any other designer) to produce a custom sketch of your wedding gown. Who needs a designer when Megan Hamilton has an Etsy shop where you can get a custom sketch for under $100? Just send her photos of your dress, and she'll send back an 11" x 14" hand drawn ink sketch on acid free paper in a few weeks.