I don't really believe in following rules in fashion, especially the "no white after Labor Day" rule. White can be worn year-round, depending on the material and how it's styled. Below is how I would wear a white/cream colored dress this fall: mixed with neutrals and a bright nail!

Burberry rain boots via Saks {here}
Loeffler Randall bag {here}
By Malene Birger dress via My Theresa {here}
Brunello Cucinelli scarf via Marissa Collections {here}
NARS nail polish in "No Limits" via Beauty.com {here}