Help with selling clothes to raise money (seeking advice)

Just before I was illegally fired I think in an effort tell myself I wasn't going to lose my job, I bought some PoshMark dresses for work. Well, now I don't have a job and since they didn't come from a store, I can't return them.

I want to try and auction them off to help cover the costs and maybe raise some money for bills at the same time. Does anyone have a suggestion outside of eBay where I can have a sort of fundraiser sale? Or how to do it?

Thanks.

Edit: to clarify, I'm hoping to auction things off in a fundraiser way, while reposhing them would likely lose me money (since everyone expects to pay less than posted price, not more).