The cardis are a cute idea if you have winter rush and you won't bake in them.
Consider allowing members to wear a sleeveless turtleneck underneath them in case the color chosen for the cardis isn't flattering to everyone. (i.e., some people look like crap in red and it can be toned down if they wear black or white or cream next to their face.)
Although if you do this, be careful about the sizing and make sure they fit snugly, but not super tight boob accenting.
For bottoms I would just stick with whatever the black bottom was for your previous philanthropy outfit and black boots.