This image is from one of my rescued slides series. This one labeled "Minnesota, Gerry's Birthday, 1960."
This might be what Eva Mendes has in mind, to be fully dressed when lounging, because you know, sweatpants cause divorce.
Link to an HuffPo article on the subject
Who really wears pajamas? Maybe if you live in a group setting, or attending a sleepover, but most of my friends talk about sleeping in shorts and a t-shirt. And you, what is your loungewear?