Egyptologists & Archaeologists in general use the term "Kilt" to describe any men's garment that is bifurcated and of short length(usually reaching to the knee or shorter.). If it's too short to be a 'Sarong' 'Toga' etc. then it's defined as a 'kilt'.
The word 'Skirt' implies a woman's garment, so they needed a word for masculine skirted aparrel. So you often read of a 'Scottish Kilt', 'Egyptian Kilt', 'Greek Soldier's Kilt' 'Mesopotamian kilt' etc. When they are not really related at all.