For some reason, some women care a very great deal that the clothing they wear is not matched by anyone else at the same event .
The obvious solution to this is to make each dress one of a kind. I propose a business that guarantees that it will only manufacture one of any particular design.
could this work? One option would be to design a new dress from scratch for each customer, but this is an impractical solution, which is expensive and doesn't scale well.
I propose instead that each garment be specified using a mix-and-match approach from a number of design components. These would include colour and pattern of the material, shape of the top and bottom sections, sub-panels, buttons and attachments and other decorations, and so on - which can be selected to suit the client's taste.
It is then straightforward to ensure that no identical or even similar item is purchased by searching a database of previous sales. As a starting point, I propose that dresses are sufficiently dissimilar if they differ by two or more components.
The interface could be electronic, which would be very much like an online 'dress up' game.
 We don't have to care why, it is enough that this is generally recognised as true.
 I think someone once told me why, but I forgot.
 Or perhaps only sell a design to the same customer again, or require permission to re-sell, or maintain a specified exclusive time period, whatever.