The fabric that we use is called "Bridal Illusion", which is a softer form of tulle made specifically for bridal veils. A one or two layer veil in the standard width will usually be sheer enough for visibility of the gown back design.
2 layer elbow length veil standard fullness
2 layer elbow length veil extra fullness
1 layer chapel length veil standard fullness
1 layer chapel length veil extra fullness
The increased number of folds in the extra full veil indicates increased fullness