Hi Little Teapot! I'm a newbie too and probably going to be sewing my costume as well. To give it a 'personal' touch as well as the economics involved.
An interesting pattern I found over the internet is Butterick B3598. It is a current pattern and should be available in stores that carry the Butterick patterns, or it can be ordered from this website that I found it.
https://store.sewingtoday.com/cgi-bi...3598&IIHO=1000....
If you can copy and paste this into your browser, it should take you to the page that shows a picture of it, what it looks like, I think.
Good Luck!
Baby Annabelle Plumbuckle :P
http://store.sewingtoday.com/cgi-bin...i?s.item.B3598