When you see a coworker in pajamas, it might be time to check the employee handbook. Unless you’re at Portland, Oregon-based Hanna Andersson. “In December, we definitely go all in and [at] our holiday parties, you’re required to wear your pajamas to the office,” Kara Carter, chief product officer of the clothing brand, told Retail Brew. “We take a big picture every year; we’re all in our pajamas.” Pajamas are business attire at the company because it’s in the pajamas-making business. In 1993, Hanna Andersson, which began 10 years earlier as a children’s clothing brand, introduced matching family pajamas in its catalog. The company was not the first to sell family pajamas, which fashion historian Debbie Sessions dates back to the 1950s, although matching PJs for mom and the kids (sans dad) had appeared years before. But many consider Hanna Andersson to be the company that popularized them, with CNN calling it the “OG brand to launch matching pajamas for the entire family.” Now family pajamas are woven—with some weaves better than others—into the retail landscape, with heavyweights including Amazon, Walmart, ShopDisney, Target, Kohl’s, and Macy’s all doing a brisk business in the sleepwear. Let’s slip into something a little more comfortable, because here are some milestones that mark how family PJs became a sleeper hit. Keep reading here.—AAN | 
