Show that you do smart casual men's style like no-one else in a hoodie and navy dress pants. Rounding off with a pair of navy low top sneakers is an easy way to infuse a more relaxed spin into this outfit. As the weather starts to warm up, it's time to shed those bulky winter layers and choose an ensemble that's lighter, like this one here. As a guy in his thirties, you probably want to start dressing more professionally. In this case, ensembles like this are ideal as inspiration.