Chambray is a common style of shirt that is perfectly business casual. It's an almost denim like material that can come in different colors but most commonly blue. Pair chambray shirts will with black, blue or khaki bottoms. You should avoid wearing blue jeans with a chambray shirt.
Navy chinos are an other classic item in the business casual wardrobe. Chinos are a less formal, and more comfortable than slacks, but more formal than jeans. The Amazon brand Match Men has stellar reviews as well as a huge selection of colors. Black, navy, khaki, and charcoal are absolute essentials for business casual outfits.
This outfit features a brown belt with similar colored boots. While it's not a strict rule, matching a belt can shoes can be a great way to look clean and put together. While there are certainly frugal and stylish alternatives, It's always a good idea to spend more and invest in great boots. A few extra bucks can go a long way. Frye, Steve Madden, and Clarks are good brands.