I commute 4-6 miles to a dressy office. I tried to wear my work clothes twice. I sweat like a beast so that just isn't possible. Plus, I don't care what that pretty lady in her lovely suit says, it's not comfortable and did I mention that I sweat like a beast?

I carry a backpack every day with my work clothes and shoes in it. I also have stashed at work, travel size toiletries and a washcloth so I can freshen up. It's definitely a challenge some days. I like some of the alternatives mentioned here. I may have to try them myself. Good luck and don't give up! Just keep trying different methods.