This was the curtain that I started with: Two tabbed toppers and some brown material. I needed to add a strip of brown to the bottom to make them longer and to add a rod pocket on the top instead of the tabs.
I sewed the two curtains together as can be seen below. Then I sewed the strip on the bottom and added a brown lining as well. I made the folds as per the pattern and then sewed the rod pocket to the top.