I like Poshmark! I’ve never sold a wedding dress there but they’re definitely on there. One of my friends used Once Wed. I would try Facebook marketplace. People buy so much stuff from there these days and you might be able to get more money from the dress if you can meet someone somewhere so they can try the dress on
Https://www.preownedweddingdresses.com/ I haven’t sold a dress but they have the best search filters of any wedding dress website I’ve found. When I started looking for dresses I used find what fit what I wanted. People can narrow by size, height, color, designer, dress features etc. I would recommend filling out as much of the info as possible when you listed it.A lot of people don’t put their height or they’ll say I wore with 3 inch heels as if we all know how tall they are.
Preowned wedding dresses, I sold a dress on there that I bought but changed my mind about. I bought two dresses on Tradesy, one of which I am using as my second dress. I’ve also seen a lot of dresses on still white. Just know that it can take months to sell a dress. It’s not usually a fast process