The Chicago Historical Society has a few online projects. One is a collection of over 55,000 images from 1902-1933 from the Chicago Daily Newspaper. Another is the Great Chicago Fire of 1871 and under the title, Just the ArtiFACTS which is set up for students and teachers, follow that title to another page which has a section "Only in Chicago." There you will find a section Chicago Graveyards that tells a history of a few cemeteries along with some images of "mourning wear." http://www.chicagohs.org/projects.html