The latest "100 years" video from Mode runs down Halloween costumes over the past century, with one for each decade. The selected costumes certainly do not represent all Halloween costumes of the era, but the ones featured show the influence of pop culture as it progresses.
This is fun to watch, and I’m glad they didn’t use the cheapest store-bought costumes available during those times. Still, I kind of wish that someone would do the same thing with more costumes and less dress-up time.