This combination of a mustard cable sweater and navy jeans is definitive proof that a simple casual ensemble doesn't have to be boring. In the footwear department, go for something on the smarter end of the spectrum and finish your ensemble with a pair of dark brown suede chelsea boots. As you can see here, this outfit is a really savvy choice, especially for transitional weather, when the temperatures are falling. A look like this will help any 20-year-old gent outshine his pals.