Lisa, I guess you were talking about the green in something else...
I tried the Kate on at the Arcadian Shop last year (it's been a year guys. Do I feel another road trip coming on?). It was pretty true to fit for an xsmall, except the sleeves were a bit long. But, that's par for the course for me, unless it's a petite.
On the boy shorts, well they always fit me weirdly. My bum is a lot smaller than it used to be, but it's never going to be firm... but it's more my cycling thighs. The smalls sort of ride up a bit because my thighs are bigger than they used to be. They fit over my azz, but I think the mediums will fit better.
I wanted the Kate precisely because it is light weight. I will probably wear it under my sweaters or Shaks. Just think, I now can have an Ibex "suit." A Shak, a Kate, and a skirt.