The different fabrics used in my kilts are woven with different selvages. The most traditional option is a true woven selvage. This is possible with cloth woven on old flying shuttle looms, such as used by D. C. Dalgliesh for our Heirloom kilt line. The House of Edgar also has the ability to weave with a traditional selvage using specially modified modern looms.
Most modern tartan mills today weave cloth on computerized rapier looms which individually cut each warp (sideways) thread and then tuck the thread back into the weave of the cloth, which mimics a traditional selvage, but also creates a thicker section along the edge of the cloth.
You can compare the quality of selvages from the different mills and tartan ranges by viewing the sample images below.