I'd also recommend <a href="http://www.amazon.com/gp/product/0896762394?ie=UTF8&tag=suggestion-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=0896762394">Medieval Tailor's Assistant: Making Common Garments 1200-1500</a> for patterns and arrangement techniques -- mostly it's a bunch of flat pieces of fabric (my wimples tend to be big rectangles, and my veils are somewhat elongated half-circles).
There's also a really good series of photos at
http://www.flickr.com/photos/racaire/se ... 406367893/ that may help you figure out how to assemble a 14th century set of linen head-coverings.
http://www.virtue.to/articles/veils.html is pretty useful, too.
I'd point you to a good clear photo of how I typically set up my veil & wimple for when I'm doing the 14th century thing, but there aren't a whole lot of photos of me to pick from (more by design than by accident, I'm not terribly photogenic and prefer to be in the background at events, anyway -- that, and I like the anonymity of not being recognized in-person everywhere I go).
Anyway, I
am in this photo; I'm the woman standing up, arms folded (to better conceal the digital camera
I'm carrying, hee!) Char, do you mind if borrow this photo as an illustration?
It's kind of a later-in-the-day sort of image, and I hadn't done anything to fine-tune or touch-up the setup since that morning -- so the veil is slightly askew, but the wimple looks relatively even.
Here's how I construct it ...
I use one of my husband's
linen coifs as the first layer.
(The bands -- like the filet that the lady at the far right in this photo is wearing under her silk veil -- tend to give me a headache if I wear them all day, and the coif just seems to do a better job of holding things together in the long run. Some women use a square piece of fabric and tie it behind their heads, like a modern head-kerchief; I like having the extra support tied under my chin, rather than at the back of my head where it's more inclined to slip off. Your mileage may vary.)
For the wimple, I take a long rectangular piece of cloth, set the middle right under my chin, and pin it to the top of the coif, kind of far back on my head.
Then, the veil, and pin it to the coif more towards the front edge -- one above each temple, one above my forehead; the veil conceals the top of the wimple, and (I believe) all of the coif.
The whole headdress only uses about five pins, but it's quite solid, and if I want to take it off quickly (or if it falls off on its own), it goes off all at once -- I don't have to fuss around in front of a mirror to take apart every last bit. It'd cover a modern haircut quite capably, too.