I could see that happening here in Central Texas. Mornings can be quite nippy this time of year. Then when you go outside at lunchtime it is 72 and sunny.
I forgot and left my jacket at work today. (No gun in it. Nor do I carry at work.) I can see the reason it could happen to a lot of people. That is part of the reason I do not carry in a jacket pocket. I am too forgetful. Heck I have a hard enough time keeping up with my head, and it is attached to my shoulders.