I use the Ice Harness for all three of my babies. It's very sturdy leather and holds it's shape very well. It's rather pricey, but with the swarovski crystals it's beautiful too. I have red for the boys and pink for my girl. You might want to take a look. I can't remember who makes this harness, but several vendors sell it and they all call it the ice harness. I've been very pleased with it. They wear them everytime we go out, and they still look like new.
If you Yorkie is a girl, you might consider a wardrobe of dresses with a d-ring attached for the lead. Bella never goes out naked! Best of luck to you.
Swarovski Ice Harness