Draperies and Top Treatments - tied back drapes

Hi, I have been trying to figure this out for days now.
I need info on making drapes tied back, with font edges being several inches longer than the finished length. This allows the panel to be tied back without the fronts pulling off the floor. It is a very wide window and is a one way draw. And they are installed over a tub. So they only come to the sill which makes it very tricky.
Nothing I have done seems to work, any thoughts?

Hi and welcome to the forum! Are you going to make them or are you talking about draperies already made? Not clear on this.
If they're already made, there's nothing you can do. They have to be made on an angle, so the lead edge is actually longer than the return side.

I am actually making these for a lady. She wants the fronts angled longer so they won't hike up in the fronts. I started with the finished length in the back and angled down 10 inches to the fronts, But the middle of the panel hangs below the window sill. I told her I believe it is a mistake and will not work since it does not go to the floor.
Thank you so much for replying

On a really wide window, you need to go straight for a bit, then start the angle. You need to start with beaded weight chain dropped down from the rod to where the tieback will start, then to the bottom, to determine how long the lead edge needs to be. Then you have to figure how much fullness will be in that area and begin the angle at that point, then that point to the return would be straight. Clear as mud? :D