If you're going to be spending any real time here in Vancouver (1+ months), i'll let you in on a local must-have.
The Taiga jacket. A simple, well-made unisex jacket with pockets, zipper and buttons, most importantly COMPLETELY WATERPROOF while being breathable (gore-tex is a wonder fabric). Also has a hood you can tuck away when not using it. Sold at Taiga Works, located on Yukon and 8th Ave. A similar coat is sold down the street at MEC (see my shopping page). These coats last for YEARS, and have a lifetime waterproof warranty. I've had mine for 9 years, and still use it regularly. They cost around $150 cdn ($110 US?). Can also double over a heavy sweater as a ski jacket.
This simple item is what allows Vancouverites to pursue a normal life outdoors, year round. That and our webbed feet.
Vancouverites tend to dress fairly casually - there is a multitude of outdoor activities here, and people often dress accordingly, even in the Business district. (Not that office workers don't wear suits, but you will see lots of people eating in nice restaurants in polar fleece and sporty clothes)