Planning on wearing a black Vivienne Westwood skirt suit with kitten heels (can't walk in big 'uns) and think a large picture hat would look fab with it. BUT..
I'm barely 5'2" and worried I'll look like a mushroom. Wore a large-brimmed hat last year with very narrow outfit but hat had an angular shape at the crown and looked lovely. I do tend towards square-ish small hats, but feel it wouldn't do suit any justice and hate fascinators with a passion. It's all black with a couple of cream accents so at least it's not a pale colour which I would steer clear of anyway. I am a fairly slim 5'2" but suit is quite a curvy shape. Aaaarrrrgghhh! will fairies start dancing around me?