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I put my night clothes on after my shower in the morning. I sleep in the T shirt and undies that I wore during the day.
The only change is that in winter I put on a pair of woolly socks when I go to bed (The steel works I worked at issued them because they don't catch fire - I think I have enough to last me for another 10 years or so)
You can't if you have a dog.
Although two ladies who live not far from us, Jack and Jill we call them, routinely walk their dogs wearing their dressing gowns.
My dog with their little dog trying to bother him. Clearly not working.............