I recently discovered this site: https://www.vaunte.com/.
It's a really well curated collection of previously owned items organized by "closet," and the featured "pre-owners" are mostly NY women well-known in business, fashion, and social circles. Very fun to page through, potentially great for buying too. I have purchased one scarf (new with tags) from a woman who is the creative director of the scarf company, and I have my eye on a Dries Van Noten dress that would be perfect for our planned Puerto Rico holiday.
Enjoy!