Well I think you couldn't go wrong with either dress, because both of them are so very well known. Rose's main outfit is the red/black one but she wore the pastel one during one of the most famous scenes in the film. So really, either one is recognizable. It just depends on your budget and your preferences. Also, if you are a seamstress, but like using patterns:
. Simplicity has a pattern for both!
As far as wigs go, here are a couple:
(can come in different colors)
And even if you don't like these, the entire website has great costume wigs. I've bought several for theater stuff I've done and they're good quality and comfortable!
Hope this helped a little~