What does fullness mean? 

Fullness is the extra fabric used across the width of the drape that provides a drape with a richer, fuller look and better defined pleats. 

How is fullness calculated? 

Usually fullness is set at a 2 to 1 ratio or 200% fullness.
Meaning there is twice as much fabric as the area being covered. Therefore a 60" space would be covered by 120" of fabric. But fullness can go anywhere up to 300% 

depending on the heading, fabric and overall look that is wanting to be achieved. 

At Joseph Ashe a 200% fullness is standard

Fabric considerations when deciding on fullness 

Sheer or thinner fabrics.usually need to have a higher fullness (300% or more) to have a luxurious look. 

While thicker fabrics, like velvet, would look perfect with a 200% - 250% fullness. 

The weight of the drapes should also be considered as there may be difficulty in gathering the drapes on the rod and be challenging to open and close them. 

Fullness comparision