Wearing a few signature eye catching pieces is definetely key. Its what generates the majority of my sales. However I also work in a "warm market", part time in a pizzeria, in a town I've worked in since I was 14. So that has its advantages.
Especially if you are in the process of learning a new skill, or you take a new direction make it a point to wear at least one or two pieces out and about. Its important for your long term and repeat customers to see you continually producing new designs, as it will continually renew their interest. I've also paired up some of my more intricate or evening styled pieces with blue jeans and a tank top while food shopping. Its a great place to "showcase" something when you know few other people will be dressed up.
Also carry a business card, or keep a small notebook where you can take down order information or names of people who wish to be sent products or details. Business cards tend to be overrated but it helps if your card doubles as say a discount on a future purchase online, because then by literally having your card they've gained something.