A cable sweater and light blue ripped jeans have become veritable closet items. As for the shoes, you could follow the casual route with a pair of work boots. Off-duty ensembles for gents over 30 aren't actually that hard, as you can see here.
Cable Sweater with Work Boots Casual Chill Weather Outfits For Men In Their 30s
For a casually dapper look, rock a cable sweater with grey chinos — these pieces work really cool together. Round off with work boots to keep the ensemble fresh. Off-duty looks for 30-something men aren't actually that hard, as you see.