Cold night at 10 degrees
I'm neither a hot or cold sleeper. This weekend I was at exactly 10 degrees and suffered slightly. I was wearing my down shirt, longjohns, and down slippers. The next night was in the 20's and all was right in my world without extra down garments.
I'm 5'11+, average build and found length and width good. I can scoot down and roll around a bit without much issue. It's not a loose fit but comfortable for me.