The belt actually goes through the bottom portion of the sleeve ( I placed an over sized buttonhole on each side to accommodate). See below:
Here is a rough sketch of how I altered the original pattern. Black lines are the original pattern, and gray are my alterations. Collar, belt and ruffles not shown.
And here I am showing it off!! I'm wearing a camis/slip under it, which is showing at the v-neckline.
Thanks for stopping by!