A light violet dress shirt and blue skinny jeans are essential in any gent's great casual arsenal. Round off with a pair of brown leather loafers to completely jazz up the ensemble. Seeing as temperatures are falling, this look seems a viable idea for the time in between seasons. As you're going from your 20s to your 30s, you probably want to start dressing more maturely. In this case, combos like this are perfect as inspiration.