Good list. Even though I have posted on other threads that my Golite Wisp windshirt is my favorite gear, you could get along without it and also the rain pants. I have actually carried rain pants, but not used them while hiking so that I would have them dry to wear in camp. or to bed if cold. (Golite Reed) That said I have hiked across the Presidentials on a windy July day wearing rain pants as a substutue for long pants . I have also stood on Mt Washington on a 70 degree cloudless July day. The skirt is a great idea to keep your shorts dry. As a long sleeve shirt which is all you need for warmth on an average day, I use a light weight long underwear top.
At this site you should reference NH, others have written about the White Mountains somewhere out west (Arizona??)
A knowledgeable White Mt. hiker, member of the Dartmouth Outing Club, has a nice web site to help you plan; hikethewhites.com
In the following photos note what people were wearing at the the start of the day and what was worn as the weather cleared traversing the Presidentials one day mid-July.