Consider wearing a mustard cable sweater and blue ripped skinny jeans to achieve a bold casual and functional outfit. Get a bit experimental on the shoe front and class up your look by rounding off with mustard suede brogues. So as you can see, it's extremely easy to look amazing and stay snug when chillier weather arrives, all thanks to combinations like this one. Wondering how to master casual outfits in your thirties? This combo is the perfect answer.