My winter loungewear capsule consists of:
1. Leggings - I like Pact organic cotton leggings as they fit me well, are fairly durable, and soft. They work well in moderate temps.
2. If it's colder, I can layer fleece leggings underneath the Pact leggings for extra warmth. Or I get out my base layers -- merino wool leggings & zip top from Land's End, or Polartec leggings & zip top from 66North (purchased when we were last in Iceland). These are meant to be worn under outdoor winter gear, but I like wearing them on their own as loungewear.
3. This wrap from Athleta: http://athleta.gap.com/browse/.....=777944042 ... super soft and cozy and warm! Over a tank top or tee shirt with leggings. I also wear this wrap nearly every day as a "bed robe" over my pj's when lounging in bed.
3. LOFT Lou & Grey SignatureSoft tunics / cowl neck tops are fabulous... https://www.loft.com/lg-signat.....ature=true... super warm, super soft, cozy, and durable. I purchased a few two years ago, wear them once a week 6 months out of the year... and they still look good as new. They are also nice enough to wear outside, or to WFH. Yet feel like you are wearing jammies.
I don't wear slippers, just warm socks. But I may get myself some Allbird loafers and use those around the house, as they are soft as slippers.
Warm weather loungewear is a whole other story... my favorites for that are maxi tank dresses from ON, or elephant pants (purchased at amazon) with a tank top.