The McCalls pattern at the near right has a bertha collar with ruffle trim and the Simplicity pattern has similar styling to Mom's dress. The pattern has an inverted V waistline seam.
Past Patterns has a wedding dress pattern (shown below) that is written up as a 1944 McCalls gown. It is almost identical to the Simplicity pattern, above. It calls for six yards of 36-inch wide material.
One other article, from England, describes but does not picture, a wedding dress made from a parachute.
There are more references to the use of parachute silk in European countries, than in the United States, since they were hit harder by World War II shortages than we were.
The Design House web-site says: (This site has some good information, and pictures, but the type is in a tiny yellow font, on a black background. I found it helpful to run the mouse over the text to highlight it, making it easier to read.)
"The advent of World War II imposed several sanctions in the forties, most noteworthy the rationing of materials that were needed for the war effort. In 1942, the War Production Board released its L-85 guidelines, which restricted the amount of cloth that could be used by clothing manufacturers. Ironically, wedding gowns were exempt from these sanctions, ..." and
"The postwar years of the 1940's brought a great demand for wedding gowns. With a large surplus of cream-colored silk parachutes at the end of the war, an enterprising sales venture was to sell the excess chutes along with an instruction folder to make 6 garments, including a wedding dress." I would love to be able to get my hands on one of those instruction folders! I did look, and found out that other people are looking, too, apparently with as much success as I had.
http://www.hec.ohio-state.edu/bradshaw/wedding/wedding_traditions.htm also testified to the availability of parachute silk.
And finally, the statement, "The white wedding dress virtually disappeared during the war years. Clothes rationing was introduced in 1941, when fashion almost ceased to exist. A few made brave efforts with parachute silk..." found here.