When Charlie was born it was freezing, & I hadn't thought about it. Luckily my MIL got onto it for me & got me some flannelette wraps they are really good. I also hadn't thought to buy any flannelette sheets & it was so cold & hard when I put him down to sleep, I put a towel down until the sheets arrived in the mail..LOL.
It was freezing over night, Charlie was in wondersuit, wrapped (although he would get out), mittens, sheet & a bunny rug!