I was only only cold in the evening making dinner (and getting up in the morning). We had planned to do some star gazing after that, but it was too cold and windy. Getting in our bags early was the solution, it just didn't fit very well with the more communal nature of our treks.

Track pants are probably the solution. It rains so rarely in SoCal, that adding more rain gear to my kit seems like overkill. Chaps are an interesting idea I will have to look into. Do you recommend any brands?