In the course of checking around various web sites, I noticed that in later episodes of the Jack benny TV show, Rochester is clearly wearing a toupee. I've posted a link to a photo below:
http://i7.photobucket.com/albums/y283/w ... f53088.jpg
Contrast this with the photo in the link below from 1941:
http://www.movieactors.com/photos-stars ... urns-1.jpg
The irony of this is obvious, given the merciless ribbing that Jack endured from Rochester in the radio days over Jack's supposed use of a toupee. As far as I know, Jack never really wore one. Typical of Jack's kindness, no humorous hay was ever made out of Rochester's decision to wear a rug on the show. I assume that Rochester was self conscious about losing his hair (he is often pictured wearing a hat in many stills), and Jack would never want to pursue comedic advantage if it was at the expense of hurting someone's feelings. Especially someone as close to him as Eddie Anderson was.