Long jones / johns are coming out?

I'll keep it short.

I was at work serving an old lady. As she left she said something like "...long jones / johns are coming out, but that's ok, as long as I keep myself warm."

I think she was refering to the recent cold weather (at least here in Ontario), but that's as much as I can tell. Could someone tell me what she meant? I don't know, I may have heard things...

Long johns are underwear with long legs, and if they have a matching top, long sleeves too. Sometimes they're called thermal underwear. They tend to be of thicker material and are used for especially cold weather.