Seems very unnecessary for a GSD. Cedar loves the cold. In fact, just a week ago she found some open water that she decided to go in. She wasn't swimming, but she was up to her belly. And for those wondering, I'm in Canada, so yes, it's **** cold, yet she didn't seem to mind one bit. I take her out hiking for at least an hour a day and she loves it. Plus she spends quite a bit of time in the backyard.
She's only 4 months and never once has she appeared cold, despite temperatures being well below zero in the past week.