The Marton Mills wool tartan that I have has a very neat tucked selvedge that has worked fine (weft yarns do a 180 at the edge and come back into the weave for about 1/2" where they are trimmed off). I'm not aware of any wool tartan weavers using a fringed selvedge like you find on denims, some woven wools and some synthetics or blends made to resemble wool (which would be undesirable and require hemming) but I only have tartan from about four different weavers, so I'd check before buying, just to be sure. Surprises on expensive custom orders like a roll of tartan would not be much fun. The more information you can gather with expanded pattern images, yarn samples for color, and nailing down the details before placing your order, the better.

The good news is that the people I have dealt with when placing my tartan orders have all been helpful, patient and terrific to work with, despite the fact that I'm not some big company ordering hundreds of yards of cloth. I actually get better service from the tartan weavers than I do from the sailcloth companies when buying fabric for work.