I love these colors together: navy, purple, and pink. I wore this for a date night with my husband and while it may scream "spring!" more than "fall", oh well. I think it's important to wear what you love, no matter what. It may not be in trend or in season, but as long as it makes you happy that's all that matters.
Trench / LOFT (similar here)
Shirt / Anthropologie (similar here)
Skirt / J Crew (similar here and here)
Shoes / French Connection
Purse / Fossil