I usually love summer, but the heat was on too high this year. So I'm looking forward to fall. Fall tends to be a more formal season, so it's a time for me to show off my crisp and cool back-to-school best (okay, I finished school a long time ago). The good news is that we already own many of the top trends of the season. Here's what to look for when you put away your summer garb and unpack your fall favorites: Belted trench coat : This look is practical and classic. I found my knee-length navy blue trench last year on the sale rack at Old Navy. Slouchy cardigan : I practically lived in my slouchy cardigans last season. This fall the style has been updated with button details, but the flowy, wrap version is still en vogue. Plaid and gingham shirts : Whether yours is comfy cotton, flannel or rayon, plaid and gingham shirts have survived yet another season. Tuxedo or boyfriend blazer : A well-tailored blazer is the perfect way to p...