Fluorescent pink with scarlet trim and dayglow orange shoes/shawl.
Well - you did ask what colours no-one else would be wearing, and lets face it, you would stand out a mile..............and be tried for murder as everyone died of a heart attack at the visual stimulus of colour
When in doubt, go with Black. Short, well cut, fitted black dresses ALWAYS look good, and are very flattering to any woman. Of course, its not very adventorous, will not be identifyable as everyone else will be wearing it, but it will look good
However,
Depending upon skin colour, and hair colour, then truly stunning dresses can have an oriental theme...like a nice royal blue kinda thing, that kinda pearlesences (yah -try spellin that without lookin at a dictionary!) in the light, possibly with a light pattern overlayed on the fabric. Of course, hair tied back in a kinda bun at the back, with spikes of hair coming out in several angles tops it off
................erm, hmm - maybe i should be quiet now