1. Winter in Korea is COLD.
2. It's perfectly acceptable to walk around in public wearing a blanket. I'm serious. I even went to work the other day and our secretary was sitting behind the desk with her legs wrapped up in one. Last week I saw some high school girls on the subway with Hello Kitty blankets worn like sarongs. The most common sight is guys carrying blankets to drape over the shoulders of their girlfriends when out for a walk.
3. In conclusion, my advice this winter is: Invest in a good-looking blanket to wrap yourself up in this winter. Perhaps a nice plaid or something in Christmasy colours. Stay warm, stay stylish, wear a blanket!