Drapery panels made with an inverted box pleat are double the fullness of the window. So they always look full and luxurious. When you close these drapes, the top of the panel is smooth and flat (creating a clean modern look). Then, when they’re open? The box pleats stack PERFECTLY.
Boxed pleat style drapery is similar to the newer ripple-fold style of drapery but with a traditional look, a 4″ header, hung on drapery rods on rings or i-beam track. Because the ‘centre of gravity’ of the this style is forward, this treatment tends to lean back from the 4″ header giving it a more unfinished look compared to the clean, almost perfect hang of a ripple-fold drape.
Most drapery fabric is 54″ wide, when sewn each panel will be approximately 24″. To determine the number of panels you’ll need to cover an opening simply take the size of the opening and divide by 24″.
Things to consider
You need to allow for stack-back, space the drapery will take up next to the opening when drawn to clear the opening. The more glass or window area you want to have uncovered, the greater the amount of stack-back you will have and the room needed beside the opening to accommodate it. A good rule of thumb is to allow for 1/3 of the width for stack-back.
Of course, if you are only looking to frame the opening with side panels you may only need 1 width of fabric or for a illusion of fullness – 1 1/2 widths per panel which gives you 24-36″ of beautiful accent drapery bringing colour, softness and height to your room.