I would say: when it comes to wrap dresses, proceed with caution
Think eerie lighting (black lights, LED lights, and glow-in-the-dark pumpkins are particularly effective), fog machines, plastic pumpkins, and fake spiderwebs for a start
For just over $3,100, Net-a-Porter is selling the Alexander McQueen cowl-neck gown Pippa wore to the royal wedding back in April, though perhaps somewhat oddly, they make no mention of this fact in the gowns listing
I also think that the demand has soared because in a lot of cases, ready-to-wear has increased so much, especially since Covid, that you now see ready-to-wear dresses consistently at $15,000, $20,000, $25,000, $30,000