Re: Obesity, Diabetes Type II and so on
"If you're going to stay in all day anyway, then putting on the easiest and comfiest clothes seems like a good idea,"
Why wear any clothes at all? As long as you are not likely to upset any prudish neighbours - then it is a healthy option.
IIRC below an ambient temperature of 18C the body will divert calories to making brown adipose tissue instead of storing them as "white" fat. The "brown" fat itself then burns calories to make heat to help keep you warm.