What should baby wear to sleep?

Sara • IVF pregnancy Mama to baby girl 11/2/19

I have the love to dream swaddle up for my LO, it says it's 1.0 tog. I've seen the infographic a few times that shows what baby should wear but I'm still confused...

If her room is somewhere between 68-72 degrees, what should she wear under the swaddle? Are footie PJs okay, or should feet be uncovered? Should she have a short sleeve onesie under her PJs? Should they be cotton or fleece?

So much FTM anxiety lol