In the fall/winter, I'd wear my work pants (dressy looking tech pants, like Outlier Slim Dungarees) and merino wool socks, but have a merino wool shirt on and cycling jacket. I change into one of about five button-downs that I keep folded up at my desk. Some of those button downs are merino wool as well, because not only are they nice shirts, they really do stay fresher than my cotton shirts. I always commute in sneakers, and change into work shoes at my desk.
In the summer, it's always shorts and some kind of loose, non-cotton, active shirt. I use a full-body, no-rinse wipe to freshen up in the bathroom and change into pants/shirt. I'd like to switch to something more sustainable than the wipes though. There's another guy in the office that just uses a hand towel and brings in liquid soap.