Chambray and khaki is a combination that's been working for decades, and it still works because neither color asks the other to do anything it's not built for. The Everywear shirt's standard length and stretch fabric move like a knit while looking like a proper button-down, holding up through a full day without wilting. The straight-fit tech pant's water resistance and stretch mean the walk to the office doesn't show up in the meeting.
Finish with brown leather derbies and a woven belt.