I am not sure when it happened, but somewhere along the lines I've developed an unhealthy obsession with lounge wear.
It started slowly some years ago when I figured out pajama bottoms were comfortable, and started referring to them as 'happy pants.' By that I mean they are that pair of pants you want to slip on after over-indulging on holiday food. Which morphed into the pair of pants you want to change into before sitting down on the couch to watch a movie. Which further evolved into the pair of pants you want to change into after work and maybe even slouch around in all day on Saturday.
To avoid the mall, I do most shopping online, and apparently the retailers have caught on too, because I've noticed lounge wear is it's own category between active wear and sleepwear. It's one of the first places I look, hence my obsession. Lounge wear is not too youthful, and it doesn't have to be frumpy, in fact, in some cases, it might even be considered sexy. I think a woman's personal style evolves overtime, and mine is comfortable.