You're right of course Darrell,

A dark colored tartan, pleated to the sett, photographed in the shadows, by a small digital camera who's mind is fried by the tartan lines...

For my jumbo size kilts the Casual model has 15 pleats, 2" deep, with a 1 1/2" reveal for this tartan.

The Semi-traditional model has 23 pleats, 2" deep, with a 1" reveal.

Obviously, those numbers depend on the tartan pattern and how the kilt is pleated. But for these two models in the same tartan I think it gives you some idea of the difference between the two.

Of course you also get leather straps on the Semi-trad.

Ron