Ain't that a wonderful coincidence? The linen we have had in stock are in the ballpark of what you needed.
That looks like a one-piece collar, unlined.
The notes would say:
"Collar shape as in the image http://www.styleforum.net/content/type/61/id/558627/width/500/height/1000/flags/LL "
You can also add "one-piece collar, unlined"