I use cat breakaway collars. . . They have a lot of fancy and stylish ones
I use Buddy belts harnesses. They are wonderful. Maximo ( Kristin ) sells them. Check out her website
Buddy Belt Harness
She has great customer service and can make sure you select the correct size.
Galen's coat is 1/2 way to full coat. and Kristin's Max and Teddy are in full coats