If you put function above all, marry a navy v-neck sweater with jeans. Slip into navy and white canvas low top sneakers for maximum style effect.
Navy V-neck Sweater with Jeans Relaxed Warm Weather Outfits For Men
This casual pairing of a navy v-neck sweater and jeans is a goofproof option when you need to look dapper but have no extra time to put together an ensemble.