Some of my favorites are the patterns for children's clothes. These are a few examples from several different periods. It's interesting to see how kids' fashion has changed in the last century or so, and how the look of the patterns themselves has changed, too. Sorry about the quality of the photos – they were all taken several years ago, before I packed everything up for storage. (Click on the photos to enlarge.)
Most of these early patterns aren't dated, but these are two of the oldest; probably from the post-WWI, early 1920s period.
A couple from the late 1940s or the 1950s, with aprons or pinafores. I would have worn something like this to school everyday.
Another one from the 1950s, very fancy. I remember my mother making me something very similar for a school play when I was about six or seven. But I came down with tonsillitis and never got to wear it. Bummer.