Tank?

[bowser]

It is a nickname for want of a better word that refers to a traditional heavy weight hand made wool kilt, as opposed to a contemporary kilt or a traditional made from a PV or wool blend fabric.
Your military kilt would qualify in that category.

[Highlander31]

Jimmy Carbomb coined the term. Since a traditional 8yd hand sewn wool kilt is so well made, you could say "It's built like a tank."