Why not opt for a navy open cardigan and grey chinos? As well as very functional, both of these items look awesome when married together. Go off the beaten track and break up your look by sporting black leather loafers.
Navy Open Cardigan with Grey Chinos Warm Weather Outfits
A navy open cardigan looks especially nice when combined with grey chinos in a laid-back outfit. Tone down this outfit by slipping into a pair of white canvas high top sneakers.