From the NY Times:
Short of installing showers or locker rooms, Mr. Norvell said, employers can designate a space as a changing room and provide space for clothing storage (his own office’s changing room consists of a five-by-five area cordoned off by a curtain). Employers are increasingly receptive to such suggestions, Mr. Norvell said. Also important, he said, has been the gradual erosion of what he described as the city’s “1960s Madison Avenue decorum,” where casual clothes and sweaty bodies were looked at disapprovingly in office situations.
Sorry, but most people will still be offended if your sweaty ass sat next to them all day long at work. And in this economy, you should be happy you have a job, not demand that your employer give you extra perks because you choose not to take the mass transit that everyone else in the office does.