Backpacking Rain Kilt or Skirt
Unfortunately it is not possible to buy an light Event parka that comes down over my running shorts.
The Solution Backpacking Rain Kilt or Skirt
The backpacking rain skirt comes over my shorts and is made of super light cuben, I got mine from Zpackes .com. I will let you know how this goes after testing.
Since the skirt is open at the bottom, there is a lot of ventilation compared to over-pants. Note that the cuben is slightly see though. Best not to go naked!
The weight for the standard length of the backpacking rain skirt is 1.6 oz. Now that is light. You can use it as a mini groundsheet to sit on or as a mat outside your tent.