I just had my daughter take some quick measurements, although I wear 34" jeans I see my waist above the navel is 36" with a seat of 40" and a standard drop from navel to floor on my knees to 24". Maybe I'd need to loose a bit of weight to utilise that tartan cloth I have?

Incidentally, located a tartan maker in Greenock, Scotland who seems to think they may even be enough fabric for a kilt kilt rather than a casual kilt. My grandfather was born in Greenock too!