Embroider a peace-sign patch on your bell-bottoms.
Denim, corduroy, or patterned pants will work as long as it has that characteristically hippie flair at the bottom. In fact, these might be a good alternative to your best pair of denim bell bottoms.
Having trouble finding bell bottoms in this age of the skinny jeans? Here's a tutorial on how to turn a pair of jeans into bell bottoms.