I have worn both white heels as well as white outfits after labor day. I think a lot of the rules have changed or simply gone away relative to when you can wear white. Not too long ago, i wore a white suit with red high heels to a Christmas Party, and no one looked twice! And if they did, it would not have mattered to me. I think you should wear whatever you think you look good in and feel comfortable wearing, regardless of the color, or time of year!