This is so cool, thank you Selena!

I'm afraid the maths is a bit beyond my level, but I still learnt a lot!

I have to add, as an Aussie, I really like Ojay (although I can't say I've been into a store anytime recently). My favourite skirt is a knee-length cotton/silk blend Ojay skirt with several tiers of frills :D (I call them ruffles, actually. Maybe that's not right...)

It's so old that it has torn in a few places but I can't bear to throw it out. I am considering getting a dressmaker to make me a new one!