What might be good for a solid, broad shouldered, and tall gal like me? As a guy I usually wore pants and a layered shirt as I know vertical lines create the illusion of being skinnier, but it will also hide any curves.
Also, since I spend most of my time getting around on a bike, any skirts probably won't work. ><
The wiki has some good tips. Read this page for some tips at the bottom for some general rules.
http://susans.org/wiki/Clothing_Sizes