Me, I fluctuate. I tend to think that it just has to be fit for purpose - Is it in fashion? Does it suit the style of the garment? Is it being used inappropriately for a large item (this giving anyone who looks at it a headache)?
After trawling the interwebs though I think that polka-dots nearly always look great on little girls' dresses. Check some of these out.
Aren't they all super cute? SY2's first birthday is coming up and I now have a few ideas up my sleeve... I just hope I have time before I head off on my holidays!