Using One Curtain Panel Per Window
Measure the width of the curtain rod if you have chosen it.
Using one curtain panel per window. Several single panels can be combined to curtain an extra wide window. The second window should be a mirror image of the first. One panel per window will look very skimpy and certainly. Purchased curtain panels always look skimpy to me because i like to use fabric generously and have nice full pleats.
A single panel may also be more cost effective for. Usually curtains are hung in pairs but an asymmetrical look can be very attractive and so you may want to hang only a single curtain panel. Long panels should look as if they are full enough to pull across the entire window. Yes i think a room s look can be ruined by the use of skimpy curtains.
So no i don t recommend it. For smaller windows where a double curtain will just be too much a single curtain panel is a much more elegant choice. They can be hung with the tie on the right or the left of the window. Can be a roman shade style or hanging straight down from the bar and pair them up with two windows to draw the eye to the center of the wall.
The amount you add depends on how far to the side of the window you want the curtains to hang. If you are splitting up a pair and only using one on a window i think it will look even skimpier. The rule of double the width for the fabric needed is important as is the use of the two curtains. Most of the time curtains come in pairs.
Yes one drapery panel per window would look out of place. For covering windows however single panel drapes have a variety of uses. Another option for a room with two windows is to pull both panels to one side and hold in place with a tie back. For example the left curtain panel should be drawn to the left and the right curtain panel should be drawn to the right.