Hi ya Monkey
I bought the Ghost jacket a couple of weeks ago in the sales and so far I've been impressed.
This is only the second Rab I have found with enough width in the shoulders, the sleeves are quite tight (and im a skinny git
) but the pro stretch panel seems to have a lot of 'give'. There is also a a pro stretch panel runnning down the side (from armpit to hem).
The only "negative" thing I have found is that the pro stretch panels do let the wind through, but as I normally wear a long sleeve baselayer this isn't so much of a problem. But I assume it does add to the breathability so is probably not a negative really.
On the plus side the rest of the fleece is very warm and windproof.
I am not sure you wil get it on over a baselayer AND a micro fleece, Rabs website call it a close fitting fleece, and it is. If you look here :http://www.rab.uk.com/products_fleece_ghostjac.html there is a review from trail magazine alongside that says it ideal as mid layer.
Hope that helps?
Oddy
p.s Just for info I bought mine from Cotswolds half price, I cannot see them online anymore but they had some in store last week.