I live alone so I don’t have to “dress for bedtime”, altho I do have a bedtime wardrobe for comfort when it’s hot or cold.
More than half of my sleepwear is NOT actual pj’s, nightgowns, etc but regular daywear consisting of short/long sleeved t-shirts, camisoles, jersey pants, lightweight leggings and socks in winter. I’m mixing and matching outfits all winter long. Cozy as a bug in a rug.
For summer - usually a cami or lightweight tee and bikinis, or shifty dresses/muu muus, and if it’s really cool AC - long sleeves and socks help.
Socks make all the difference in “feeling” warm. Start out by wearing footies; if you need regular socks, go for it.
My best sleepwear is body hugging like a second skin (not loose) and lightweight. Think of how you dress your babies.