A grey puffer jacket and light blue jeans are the kind of casually neat items that you can wear for years to come. Introduce a pair of athletic shoes to this ensemble to add an air of stylish nonchalance to this ensemble. So if you're on the lookout for an ensemble that's on-trend but also entirely spring-friendly, look no further. A no-brainer getup proper for teenagers who prefer to dress casually outside of school.