I'm 5'7 and prefer to wear petite trousers ! being tall or short it depends how long your torso is compared to your leg length, and of course your preferred trouser length.
Personally I like and feel comfortable in the ankle grazers, around 27-29" which I always wear with ballet pumps - I don't possess fashion boots or killer heels so never wear boot or longer lengths that cover my feet.
I too met Kim many years ago at a Q fashion event. She is quite tiny which surprised me. She didn't converse well on anything other than her own range, maybe it was shyness, but she does appear to have a photographic memory on her own products.