Opt for a beige overcoat and a navy suit for incredibly smart attire. If you need to instantly play down your outfit with a pair of shoes, why not introduce a pair of grey suede low top sneakers to the equation? This getup is really a must-have if you're looking to keep warm this winter season and look equally stylish. Take inspiration from ensembles like this if you're aiming to add maturity to your 20-year-old's style.