I love my clip-ins. Currently, I am using Remi Platinum Series 14inch Clip In extensions. They are fantastic. I love real hair extensions, the synthetic looks way too obvious when I use those.
Here is a video on a quick style you can do with longer hair.
I didn't do a fully authentic "Gibson Girl" look. This is modified in order to be quick and easy. Excuse me not having make-up on...you may want to keep small children away so they aren't permanently scarred.