Well, first of all, it's not a hemline. It's the selvage line.

And I don't like anything below the top of the knee cap. One kilt is even about an inch above that, and I like it the best, I think, since the back of the kilt doesn't hit the back of my legs.

The longer kilts just don't look as sharp to me. Even Scotty Thompson called 'em "trollopy!"

But you know what opinions are like.