Why not wear a grey coat and flare jeans? As well as very functional, these two items look fabulous paired together. For footwear, you can go down the casual route with a pair of low top sneakers.
Flare Jeans with Low Top Sneakers Smart Casual Warm Weather Outfits In Their 30s
Team a dark green leather trenchcoat with flare jeans for a comfortable look that's also put together. Low top sneakers will give a sense of playfulness to an otherwise standard look.