Lust vs. Must: Black Ankle Boots

Tis' the season for this Fall's hottest trends, That's right a pair of all black boots,,, Booties. I don't know about getting a pair of Gareth Pugh ankle booties (I am NOT about that $$$ right now), but them Jennifer Chou's are right up my alley. 

What are your Fall "Must-have" trends?