I also can't see Q starting to flog wedding frocks, but at least it would be something different.
The Presenters also wouldn't be able to trot off their usual spiel of being able to dress it up or dress it down, perfect to take you from the desk to dinner etc.
I bet you'd also getting some customers taking the P, ordering the Dress, wearing it for their big day, getting all those lovely wedding photos in it, and then returning it for a full-refund under the 30-day mbg! Rather than moth-ball it and sticking in the loft like most people!