Satu Tuohimaa supports her family reselling vintage clothing through online platforms such as Poshmark Inc. Photo by Satu Tuohimaa

Satu Tuohimaa, 44, recounts her biggest thrift flip: She unearthed a vintage ’90s Dolce and Gabbana leopard print dress at a Value Village store, costing just $12, and sold it online for the stunning price of $1,100.

“It was vintage, it was trendy and it was couture,” said Touhimaa, who goes by the handle @laviebohemecoll on Poshmark, which has emerged as the most popular online fashion marketplace for used high-end clothing and accessories .

She had researched the item online to determine what the same dress had sold for elsewhere. Seeing it had fetched $2,000 through another seller, she listed it on Poshmark for $1,200 and accepted an offer for a l

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