As far as transitional looks go, Jessica Alba got it just right, topping her flares with a preppy-cool striped blazer for an event in LA. We love that this style setter's knack for outfitting street-chic translates so easily into our own wardrobes. This one's especially perfect for the change of seasons and walks that line between casual and sophisticated, thanks to easy separates with a dressier feel. A bow-tied blouse feels infinitely more polished than a basic white tee, tucked into a pair of high-waisted denim. Throw on a striped blazer like Jessica's and finish with a little arm candy and a pair of platform booties for a style you can take to the office and right out to dinner. Love the easy-chic feel? Shop our editors' picks to channel Jessica's style.