I've always liked them, and in my suit-wearing days, had my trousers made that way. I also wore them with coloured felt braces, before those became associated with City slickers and Wall Street sharks.Excellent reply ferum and most appreciated. I shall explore those suppliers you made mention of and hopefully find what I am after. I may still look at the tailored bespoke route and I'll try a few local shops for pricing and material choice.
Indeed I am after the fishtail which is very defined and raised at the back and not just simply a 'notch' as you rightfully describe.
Why? I used to have a few pairs well in the past and they are trousers which have always rather suited me. It was a suggestion from my wife as she does like different and she knows what suits me more than I ever do. Plus I do like braces but the usual clip on type never quite look right to me. Buttons are a far more attractive and practical preference.
The very high waist is, I think, better suited to those with a slimmer figure. Until I gave up smoking in my fifties, my weight and measurements were the same as in my twenties, and I could carry it off. Alas, not the case now.
I'll be very interested to know how you get on, and where you find what you're seeking.