Nigel
I live a wee bit north of you in Forest Grove,Or.
Welcome to the fun.
If your father has not seen you in a kilt, go to costume rental place, Rent one for a week or so and let him see you in it. I think a picture is worth a thousand words.
If you and he are sold on your kilting you are in business.
Go for it.
The first kilt I wore I rented for a week, I was sold and started purchasing my own.
I also have made three kilts.
Robert "the kilted" Lamb