How do I stay warm in NYC during December? Layering up! I wore a thermal long sleeve under my chunky pom-pom sweater and topped it off with a black puffer jacket. Since I wanted to keep my legs warm, I opted for my favorite high waisted jeans! To keep with the casual theme and since I love walking in the city, I wore my platform sneakers! LTKFindsUnder100 LTKSeasonal LTKShoeCrush