A grey shawl-neck sweater and grey sweatpants are absolute menswear essentials if you're putting together a casual wardrobe that holds to the highest fashion standards. Complement this look with a pair of low top sneakers et voila, this outfit is complete. So if you're looking for a look that's stylish but also feels entirely season-appropriate, this one fits the task well. This getup illustrates how to stay fashionable as you turn 30.