K-worthy look, Una. I LOVE all components—skirt, jacket, and pumps!
By the way, what IS that jacket? (She says eagerly...) I, too, am beginning to wonder if the Juniors department might be an unexplored place of fabulous finds...
Those pumps are SO great I can hardly stand it. I want 'em. But I might have a similar problem to yours. My heels are narrow such that I really can't wear pumps at all with hose. I can manage them without hose for the reason Amy mentions. But heel grips have never ever worked for me. I do think you could experiment with sizing down and I also think Rachylou's idea MIGHT work, although again, it has never worked for me for more than a few wearings.
I also divide my shoes into categories. Casual/hiking/snowboots need to fit with a heavier hiking type sock. Fashion boots with a thin sock or tights. Pumps (or in my case, Mary Janes, since the #$*@ pumps won't stay on) need to fit with bare feet, thin hose, and light tights. Occasionally, as a result, I'll go a half size larger for outdoor boots and a half size smaller for sandals. But it depends on the make as well.