It shows you what parts of the images go where. Its in JPG format.
The hair map size is 512x512 - but I'd generally recommend resizing your actual texture to be about half of that.

The head dress layout map can be downloaded here:

This also shows you what parts of the images go where. Its in JPG format.
The headband map size is 256x256, I'd resize it really really small if your cloth/bow isn't that detailed, or larger if you want clear details - but thats up to you, again I'd suggest something on the smaller side.