With bridal illusion and glimmer illusion you have your choice of fullness.
Veil fullness will further shape your veil. Veil fullness is from the width of the fabric, it effects the number of folds from gathering the veil and how fluffy or sheer it is.
Illusion is lightweight and comes very wide, 108 inches. The whole width can be used or it can be cut narrower for less fullness. The other veil fabrics are not as wide and they are thicker.
Full Width
Full width is 108 inch wide bridal illusion or glimmer illusion. See Full Width Veils we have made.
For a Traditional Short Illusion Veil: A traditional veil is gathered all the way across the top. The shorter the length the fluffier and poofier the veil will be, and adding tiers will make it even more so.
For a Traditional Long Illusion Veil: Full width at longer lengths is recommended. The longer length will weigh down the fluffiness and poofyness of the fabric, but it also makes narrower veils look too thin. Full width gives a long veil nice body and a full train area for royal and cathedral veils.
For a waterfall veil: Full width is required for longer waterfall veils as we cannot get the waterfall effect with a narrower width. For shorter waterfall veils full width is good and medium will also work.
For an oval veil: Full width is recommended. An oval veil is not gathered all the way across the top, so full width on an oval veil will not be poofy. Since an oval veil is not gathered all the way across the top, extra width is needed so the part at the sides not gathered is not too short.
Medium Fullness
Medium fullness is 72 inch wide bridal illusion or glimmer illusion. See Medium Fullness Veils we have made.
For a Traditional Short Illusion Veil: A traditional veil is gathered all the way across the top. Medium fullness still has body and some fluffiness, but not as much as full width. Medium fullness is a good choice for shorter veils, especially 2 tier veils.
For a Traditional Long Illusion Veil: Medium fullness will also work (except for royal veils which require full width), but the veil will look thin and narrow compared to a full width wedding veil. The train end for medium fullness is a smaller circle shape.
For a waterfall veil: medium fullness will work for shorter waterfall veils, at a shorter length we can still cut it to get the waterfall effect. For longer waterfall 
veil you must use full width, but the thickness at the top can be minimized by choosing the wider 4.25 inch clear plastic comb.
For an oval veil: medium fullness is not recommended. Unless you want a veil with hardly any gathering at all, the 72 inch width does not provide enough fabric for a veil with each side not gathered and a center that is.
Sheer Fullness
Sheer fullness is 54 inch wide bridal illusion or glimmer illusion. See Sheer Fullness Veils we have made.
For a Traditional Short Illusion Veil: A traditional veil is gathered all the way across the top. Sheer fullness veils do not have as many folds from the gathers, but at shorter lengths folds will still be apparent. Sheer fullness makes veils more transparent, but they also thinner and have less body.
For a Traditional Long Illusion Veil: Sheer fullness is not recommended at the longer veil lengths because the length makes it end up looking far too thin and narrow.
For a Waterfall Veil: Sheer fullness is not recommended except at the shortest length (25 inches or less) because it does not have enough width to cut the veil at the angle needed to form the waterfall effect.
For an Oval Veil: Sheer fullness with not work at any length because it is not wide enough to gather part and leave part not gathered.
