I don't have much experience with Tau robes, but as a seamstress, I can answer a few of your questions. Firstly, lining serves a few different purposes. It protects the outer fabric from sweat, provides the wearer with a more comfortable fabric against their skin, and changes the weight/drape of the garment. As for the type of fabric you may want to use, there are advantages and disadvantages to all fabrics. Plain old cotton is going to billow with any gust of wind. Satin and silk, although luxurious, don't breathe all too well. IMO, a robe is best made from a lightweight flannel, since it breathes well (cotton), but is heavy enough that you don't have to worry about flashing anyone or holding on for dear life as the wind tries to drag you away. This is also an advantage if you'll be working around a lot of open flame. You certainly don't want your robe getting caught in the wind and catching fire!
In the end, it truly is personal preference. My advice is to go to a local shop that sells fabric and spend some time walking around feeling the different ones they have. It will really help you decide what you need. Then your best bet would be going to a seamstress/tailor/custom clothier and asking them to make you the robe themselves. My assumption is the symbols would be embroidered on, in which case you'll have to find an embroidery place that does custom designs, or ask the person that is making your robe if they do embroidery work.
Hope that helps!
This post has been edited by amongthehidden: Jul 14 2015, 06:40 PM
Tougher than LaCrosse,
More exciting than Football,
Less competitive than Solitaire.