Back in olde times, Halloween wasn’t the big deal it is today. The trick or treating, the parties, it just wasn’t as prominent. Although, as the ladies above demonstrate, the “sexy” costume dates back to at least the 1920s (honestly, no idea where this image came from or if it’s at all Halloween-related, I just dig the flappers).
One thing that does seem to have a place in history is the Halloween postcard, and the Toronto Public Library has an extensive collection. Even better, a great number of the things are online for your enjoyment. Most seem to be from the early 20th century, and range from the adorable to the downright creepy.