Honestly I wouldn't put a whole lot of thought into what I wear to bed at night as long as it's made of fabrics that provide positive tactile stimulation and keeps me warm/cool when necessary. And I would think any girl who actually tried to go to bed with a "look" in mind was a bit odd.
I don't really know what'd look good for a girl to wear to bed haha, I think a full pj set would be nothing short of absolutely adorable! But I guess a cute t shirt and maybe some boxers or shorts would also look charming. I'm not really fussy when it comes to girls tbh, she could wear whatever she liked and I wouldn't really pass any opinion on it, as long as the girl is happy then that's what matters. :)
If I'm with my boyfriend, either a tank top and underwear or naked. If I'm by myself/with girl friends, a big tshirt, shorts, underwear. The only 'real', cute, matching pajamas I have are when my mom buys me pajamas ha ha I'm too cheap to spend money on clothes that I'll only wear when sleeping
Pajama pants or shorts with a t-shirt. And they never match. I can seriously never find a pair of matching pajamas. Last night I slept in purple pajama pants with Christmas trees and some random t-shirt. I mean seriously, you're going to BED. Sometime's I'm lucky I manage to match my clothes during the day.
Usually just a tanktop and panties. If it's colder I'll wear sweats and if it's hotter I'll wear my birthday suit.
Me and my sister have a running competition on who can buy the lamest/fruitiest pjs so I have some awesome onesies and button up pjs :D I also like sets and sexy nighties/sleepwear - but I rarely wear them. They occupy a wonderful place in my drawers though. =D