Here’s just one tip from 101 Daily Tips for a Better Resale Shop, a mini-Product for the Professional Resaler at our “Have Lunch with Kate” Luncheonette. These are especially potent because so few retailers of any sort observe them.
1- Learn and USE your customer’s name.
2- Keep a file of customer purchases. A quick glance means you can suggest something.
3- Maintain a new arrivals area for constant shoppers. They’ll love to see what just came in.
4- Realize that sometimes exceptions to the rules have to be made.
The fact that these 4 ways to have happy customers costs your shop nothing money-wise…well, that’s just a bonus, isn’t it? See all the resale-specific mini-Products available to consignment, resale, and thrift shopkeepers.
Auntie Kate The Resale Expert 
2 (a): Keep a file of customer purchases. Call when something comes in you think they’d like. They’ll be thrilled. (and so will you)