If you're looking, I found this one on Baxterboo.com, but I'm sure you could find the same on another place. I ordered the smallest possible, and it fits Miya perfectly. It looks like it's comfy for her and it's all velcro so, easy to put on and off!
Cloak & Dawggie Harness Vest with Brown Fleece Lining - Pink at BaxterBoo
Cloak & Dawggie Harness Vest with Brown Fleece Lining - Pink at BaxterBoo