Recurrence pattern: Every year on the Sunday after the fourth Thursday in November.

Secondhand Sunday is observed on the Sunday after Thanksgiving and was founded by Poshmark to promote sustainable shopping practices. The day encourages individuals to purchase secondhand clothing, accessories, and home decor, emphasizing the benefits of reusing items and supporting independent local businesses. Typical customs include visiting vintage shops, thrift stores, or antique shops to find unique gifts or outfits, as well as engaging in crafting to repurpose thrifted items into personalized presents. For those who prefer shopping online, platforms like eBay, Poshmark, and ThredUp also participate in the celebration. The event highlights the importance of circular fashion and making economical choices during the holiday shopping season.