My name is Blacklist VII, and you've asked the right person to answer this question!
Selling wedding dress is my profession
According to my 30 years experience of crashing weddings, I suggest you to sell the wedding dress to your daughter, that way your wife can keep the memory and still make some money.
How about no. If ur divorce or just need money the answer is no. Like a child comen to the new world the wedding dress is kept.. a billions reason but simply its still ,get that thought out of ur head .. even if both of u decided to sell how about NO still. It may not be a regreted but later on u c why I said capital NO.