Consider Fullness to Determine Width. To avoid draperies looking like a stretched sheet, you need to consider adding fullness for additional width to cover. Curtains and draperies should be 1.5x-2x times the final measured width. More fullness will create a richer, more opulent appearance.
You determine the fullness ratio to create folds according to the header type. You determine how many panels you need to achieve the desired fullness. The fullness ratio varies by header style.
Header Style, Fullness recommended
- 4-IN-1, 200% fullness
- Flat hook, 200% fullness
- Tab top, 150% fullness
- Back tab, 200% fullness
- Rod pocket, 200% fullness
For example, your rod length is 100 inches, for 4-in-1 header style, total width you need order is 100 x 200% = 200 inches, then you need order 2 panels, each 100 inches width.