It is appropriate to wear any damn jacket you have on hand when the weather turns unexpectedly cold and rainy and you have to walk from a car to wherever. What part of this do you not understand? Once I had to wear a parka over my Easter dress when we had a snowstorm here one Easter. I of course took it off when I entered the church, but I wasn't going to freeze to death simply to make my outfit look better.
AND, the spaghetti straps are covered by a sweater, which even if you don't like it does cover them.
Get a life.
Well said....I agree.