Today I had to stand in the rain for most of the day as I observed some digging and collected confirmation samples.
And it was while I was out in the rain... rain that was intermittent, where we would get 30 seconds to a minute of heavy rain and then nothing to a light mist for an hour... that I learned that my rain jacket was not rain proof.
I first noticed that my armpits seemed colder than they should. Then I noticed a similar feeling at my elbows. When I was able to take a break and get inside, I found I was wet from the shoulders down.
Fortunately, I had a spare work shirt and a second rain jacket (Columbia, so I know it's good), and finished the day in two jackets.
Now, I have to go shopping again...