In the car I have both a class III vest and a cheap hooded, water resistant windbreaker that I added front, back and sleeve cuff strips of the hi-viz and retroreflective combo iron-on to. Sometimes I make long trips in nice clothes, so I like the idea of being able to cover my shirt completely for a roadside repair and improve visibility at the same time, plus it's light enough to be a rain jacket even in the hottest part of summer. Clear, comfortable weather and everyday clothes, I just grab the vest. I also grab the windbreaker sometimes for short spring and fall night rides, and both items are part of my 72 hour kit, since the vest would make a great signal flag or could be cut up to mark a trail.