My Max loves wearing a robe. His beloved robe was getting a we bit too short so he asked for a new one for Christmas.
I just laid out his old one and made cut a new one from the old, adding a little width and length. Polar fleece is so forgiving. It turned out great despite some minor pattern inconsistencies.
I left it un-hemmed on the bottom and sleeves just so I could make sure it was the right length. Then I finished it up after Christmas. Now I have a Happy Max with a robe that fits!