If you are selling, there are some Instagram accounts that constantly come up in my Explore feed (you know, when I’m standing in line. . …) from people who are professional resellers, meaning they buy at thrift or Goodwill-type stores and resell on Poshmark. I actually find them pretty fascinating. If you search “reseller” or “poshmark” on Insta, you’ll get more tips than you ever thought possible. I find that most Poshers are not actually selling clothes from their own closets any more, but things they buy specifically to resell.
I don’t sell, but I do buy on Poshmark, in spurts. I have bought some things I love and some that went straight into the Goodwill bin. It works best when I buy something that is exactly like one I already have–a Boden dress in the same style but a different color, for instance, or a replacement Athleta cashmere sweater when mine finally wore out from near-daily wear. The biggest tip is to like (click on the heart) anything you’re interested in; it not only makes it possible for you to find it later (it can be nearly impossible to find it again once something gets buried), but also, probably 80% of the time, the seller will eventually send you a discounted offer on the item. You can accept, counter-offer or, of course, ignore the offer. Poshmark’s search function is excellent if you’re willing to check all of the boxes for the brand, item type and size. You can even load your sizes into your profile and just check “your size” in the search bar.
I am not at all squeamish about buying previously-worn clothes (and the environmental benefits to buying used clothing are appealing even to this die-hard capitalist Republican), and although I’ve received some Poshmark items that were more worn than they appeared in the pics, nothing has ever been unclean or icky. I did recently receive a Peruvian Connection pure alpaca dress with light deodorant stains that the seller missed, but even with the dry cleaning cost added in, it was a steal. Without the deodorant mark, I would have thought it had never been worn. Of course there are plenty of items sold NWT, and you can screen your results accordingly in the search bar.
I don’t know how Poshmark works if there is a dispute with a seller; I’ve never had one worth fussing about, but the most I’ve ever spent on a single item was probably $75.