If you gravitate towards casual combos, why not rock a harrington jacket with a dark brown long sleeve shirt? For an on-trend hi/low mix, complement your outfit with a pair of white leather low top sneakers. So if you're hunting for an ensemble that's seriously stylish but also totally spring-friendly, this one fits the task well. Wondering how to perfect casual outfits as you move into your 30s? This combination is a good illustration.