The difference between winter jackets and winter coats is more informal as many coats have qualities of jackets and vice versa. The commonly understood separation has to do with length and weight. Winter jackets usually run shorter, to about hip length, and weigh less. A coat has an understood assumption of being thicker, heavier and longer, often down near the knees. Both jackets and coats provide extra protection for cold days, and you can find sales for both at The Last Hunt.