Model Alessandra Ambrosio always nails boho chic, pairing flowy pieces with edgy extras for casual looks that are equal parts sexy and laid-back. Here she works the duster cardigan trend layering the longline sweater over a simple t-shirt and skinny jeans plus wedge booties. I love the black and white geometric print on her cardigan, a detail I tried to pick up with a tribal print bag instead. Love the look? Read on for the budget breakdown...