Selvedge is the finished edge on the material. The threads are looped back into the finished product during manufacture. This will not ravel like like a cut edge. A hem is material folded and sewn up to prevent threads raveling. So a hem would be two thicknesses and a selvedge one. SWK are traditional style kilts worn up above the navel (24" length) my first and currently only kilt is a SWK heavyweight, Sportkilt is worn lower and has and elasticated waistband. Welcome from Burlington You are surrounded by many X-Markers and meet monthly for drinks, just look for post, calling all SOKS (Southern Ontario Kilt Scotciety). SWK are traditional style kilts worn up above the navel (24" length) my first and currently only kilt is a SWK heavyweight, Sportkilt is worn lower and has and elasticated waistband.