Do they have special reasons for it?

I saw a woman who wears a pajama on the street in the downtown.

Then, I remembered that a lot of local people wore the pajama on the street when we came to Shanghai for the first time in 2002.

Though I saw only her at this time.

It is very interesting!

Was it a general custom for China people?

Otherwise, do they have special reasons for it?

Is it still going on?