I'm not working now, but I commuted a lot last spring. I brought my clothes and lunches in on Monday and always left a spare pair of shoes, a jacket, and hygeine supplies in my classroom. I showered before leaving and I got there early and washed up in the staff bathroom. Since I commuted on my road bike, which can't hold a big bag, I carried my stuff in my Camelbak, with the bladder taken out. I didn't have to bring a lot, usually just a lighter weight jersey for the ride home. I could not have commuted in regular clothes; I have to wear bike shorts! It was about 14.5 miles each way. However, you can buy liner shorts you can wear under regular pants.