The before picture doesn't show the all of the drapes because my window isn't that tall to show all of it.
So, as you can see, the inseam was in the middle of the drape. I use my seam ripper and took it apart. sorry I don't have a picture of that step.
after I took the inseam out I began sewing the ends of each. Here is what it looks like
Sorry it's a little blurry. Since I didn't really have time to take the whole thing apart to sew inside out, on the top I just sewed it together and then started sewing on the inside. picture below
And here is the after
I think they look pretty good. Do you have drapes that you have done where the fabric was super thick?