A black long sleeve t-shirt and black chinos are a nice combo worth incorporating into your off-duty styling collection. For a classier vibe, why not add black leather chelsea boots to the equation? As a man in his thirties, you probably want to start dressing more maturely. If that's the case, looks like this are a goofproof option.
If you're on the lookout for a relaxed casual yet sharp look, wear a black long sleeve t-shirt and black skinny jeans. In the footwear department, go for something on the dressier end of the spectrum by sporting a pair of black leather chelsea boots. Ideal if you're in search of some amazingly inspiring casual style for maturing gentlemen.