Pajama pants have taken over the classroom and the workplace as the younger generations opt for the comfy chic fad that was spearheaded by celebrities this summer — much to the chagrin of parents.

Celebrities such as Blake Lively, Sarah Jessica Parker, Beyonce and Elizabeth Olsen are leading the charge in the "pajama pants" fashion trends, seeing A-listers and online influencers alike ...

Sales of "activewear" to girls ages 13 to 17, including sweatpants and sweatshirts but not pajama pants, rose 21% last year over the prior year—much faster than the 7.8% rise of apparel sales ...