I have now measured everyone individually. I go from collar to tail and then girth where I want a strap to go. I made Eloise's coat and fit it on Riley, since Eloise wasn't here and she is a little smaller than Riley. What I didn't realize is that although she weighs a little less and is a litle thinner, she is actually slightly longer than Riley. Her coat fits but would have been nicer if it was a little longer. I am customizing her coat pattern and will be making her a new one soon.