The Thunderbird is a supernatural being that looks like a giant Eagle. He creates Thunder by flapping his wings and Lightning flashes from his eyes.
Chest 58, back 22.
Each Sweater is unique and one of a kind. They are not standard sizes. The stated sizes are generalization. Consider that some sweaters are tapered at the bottom and some aren’t. The chest size of the sweater should be 2-4" larger than the size of the person wearing it. The back measurement is from the base of the neck to the bottom of the sweater.