We are going to a concert this afternoon. What to wear?

My thought process: have to wear my knit pants so I can sit more comfortably (which is just my issue, but the rest of this is relatable I'm sure), so that means longer top. But it has turned warm and the auditorium is known for being hot, so my new tunic sweaters are out. So a long sheer blouse from Spring/Fall? And then a coat or vest in case it is cooler than I think, or cools off later? Which blouse looks least Spring? Maybe that is going too far to cool, go with the vest so I can leave it on inside? Do I want a scarf, or jewelry? I guess that will depend on which blouse, if I can ever make up my mind.

DH's (lack of) thought 10 minutes before we leave: trousers, shirt, grab a jacket, "are you ready, let's go!"

Grrrr.