Thanks, ladies. Sounds like I might have to make a choice between what shoes I want to be able to wear with these... The black ones are my tallest and I have maybe one other pair (platform sandals) at this height. Most of my other heeled shoes and boots are the height of the red ones, so that's probably a wiser choice.
KL: Good point about the waist slipping... these are quite stretchy so I suspect they may actually slip slightly.
It's been a looooong time since I've had to choose hem length on flares (my other ones are all several years old now!) So much easier with straight legs...
Waiting to see what Angie says....