In an increasingly crowded market for online used-clothing sales, San Francisco-based consignment startup Threadflip is shutting down after garnering more than 1.5 million users and $21.1 million in venture funding, according to a report in Fortune. The company told users in an email yesterday that it will team up with Le Tote, a women's subscription clothing service, but didn't go into details about how that partnership would work, Fortune reported. Threadflip members were told they would receive...