I wear jackets year round, what changes is the inner pieces. Summer, short sleeve or sleeveless blouses, spring and fall, 3/4 length sleeves. Moment that thermostat goes down to the 40's is turtlenecks. Outerwear is mostly 2 trench coats, one mid leg length for cooler months and one ankle length for the snow. Unless it really cold, then I telecommute or break out the big fluffy parka that makes one look like a snow man.
