We all seek practicality when it comes to styling, and this laid-back pairing of a crew-neck sweater and black sweatpants is a vivid example of that. Why not complete your look with white high top sneakers for a fun vibe? While it can be tricky to look stylish in extreme weather, it's combinations like this that prove it's quite doable. This ensemble demonstrates that hitting 30 is no reason to avoid casual clothing.