Amber, we have an 8 foot wide picture window in the living room. Three 4' wide sheer panels with swags on the side do nicely.
We also have a 6' doorwall in the back. We have an insulating curtain, white fabric inside, some kind of plastic that does not feel like plastic toward the doorwall and a fiber between them for more insulation. We did have to leave a little space before I figured out how to cut down the humidity in the house easily some years ago or the drape would freeze to the window because it insulated so well.