Disclaimer: I am no expert at anything, except NOT being at expert at anything. These tips are just something that have helped me, or someone else, or could help me, or you. That's my goal. I'm not all about the telling you what to do. So take them as you will.
Always leave a pair (or 2) of undergarments in your car. You never know when you might need them! I keep some for me and my kids, just in case!
I usually keep a pair of socks in the trunk as well. Why? Just because...
What can I say? I like to be prepared.