I've tried to include all the points mentioned in the other thread, thanks again to all people who had a look - you were very helpful!

+ Lighter colors (white, midtones, pastels)
+ More variation (print, pattern, shine, textural interest)
-> florals, paisley, lace, metallics....

+ Skirts
-> one or more skirts that also work with tights
-> one summer skirt (a full white one?)

+ Dress(es)
-> one or more dresses that also work with tights
-> one summer dress

+ Footwear
-> Comfortable fab sandals
-> Oxfords

+ Pants
-> non-denim summer shorts
-> non-denim pants (cotton twill/slouchy pants in a bright/light color)

+ Tops
-> some more options (button front, blouse, tee?)

+ Jackets
-> Something to wear over jeans (non-denim jacket/blazer)

+ Bags
-> Canvas bag in a light/bright color

Next fall:

+ Booties
+ Wool coat
+ Winter coat

What do you think? Is it complete? I'm going to print this out in the end and refer back to it.