Thanks, ladies.
-Suz, it's good to know that I will not look seasonally confused wearing my magenta linen jacket in the Fall. Actually, I have not worn it yet, I have been favoring the beige one which is easier to match in the summer.
-Unfrumped, thanks for the suggestions on how to wear the linen jacket, matching it with Fall stuff should do it.
-JAileen and Mary, I think the linen issue also depends on where you live. If it is in a friendlier climate such as CA then you can wear happier looking garments. Actually fashion in general looks happier in areas with milder climate whereas in the Northeast it can get quite sober, with a lot of black and gray as the Winter approaches and sets in.
I was under the impression that in four season weather areas linen was not to be worn after Labor Day but I will give it a try on early Fall as long as the weather is warm, like SaraL said.