Scour the Inventory
I've been able to find a healthy mix of new and old items across most online marketplaces, from NWT By Far handbags to '90s Gucci bamboo heels — you just need to know where (and how) to look. I recommend scouring new arrivals and specifying "vintage" in your keyword search as a surefire way to find the real archival treasures. Otherwise, shopping the collections curated by staff editors is a fast track to some of the best offerings.
Unless you're on the hunt for a heavily on-trend style or ultra-rare vintage piece, you won't be hard-pressed to find something chic. This is especially true of handbags, which resale sites seem to carry in droves.