Kerry, I am short waisted; there is not a lot of room between my breasts and my natural waist. (Angie has posted about a way to measure this with hand-spans to determine if you are average, short-waisted, or long-waisted.) Since I am short-waisted, high waisted pants try to sit up under my breasts (not good!). Also, making matters worse, I don't really have much of a natural waist to begin with because I am a rectangle, so a lot of high waisted items are too tight for me in the waistband. I'm better with a mid-rise, which hits just above my hips usually.
I believe the best bodies for high waisted trousers are long waisted women like Tanya, or normally waisted women who have actual waists (hourglass).
Angie I am sure would have more to say on this, but I hope this is helpful!