I bought a rainshadow in Feb/2010 at the...
I bought a rainshadow in Feb/2010 at the Ventura store. It's a medium and it fits me loosly, but very well. Both that jacket and the Wanaka are listed as "regular" fits by Patagonia any idea if a medium here is a comparably sized garment?
The medium Wanaka Down Jacket should fit you very similarly to your Rain Shadow. The insulation might change the fit slightly, but not enough to bump you up or down a size.