It sorta depends on what you're selling. "Normal" clothing usually isn't worth it, the market is quite saturated on that stuff. Shipping would also cut significantly into any money you could make, so try seeing if local consignment stores are accepting.
Yeah, I can see what you mean by the market being saturated. Last time I tried a consignment store, I ended up having to donate most of the stuff I brought.
I listed a few items to try online sales since I at least have the closet space for now. Worst case is I end up donating it. 
I've been considering selling old clothes on eBay.
wherever you sell, just mark everything as "vintage" and fashion mfs will hype it up more than it deserves
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