I wear under armor, even in the summer. Then when I get to work I simply take it off. It absorbs the sweat. It seems counterintuitive--to wear MORE clothing--but then you just take it off and wash it.
I'am agree with you for wearing under armor , but what's happen with the smell from the sweat ?
I rike my bike from home to my office every morning (without the weekends) and before time I use the same technique for the sweat as ripanderson902 , but now I just change my bike t-shirt with work shirt and i'm perfect for work. Just wear a backpack for your clean clothes. Check out my business website