My wife is from the south of the United States and staunchly believes that come September it is culturally unacceptable to wear linen.
I grew up in a German-American family and never once thought of this as a real rule. If it's warm I'll wear linen; even in autumn, like now, I'll often wear linen depending on the temperature.
We now live in Europe and she still believes this American rule applies, I simply find it invalid. European natives, do you have opinions on this?