Jessica Alba:
As a general colouring rule, you should know that bright luminous colours, such as yellow, make everything appear larger visually. So why would an hourglass shaped girl want to wear it in a skirt, with a black top? That is not a good choice, besides the fact that the skirt is also printed with plaids.
Another mistake? The shape of the skirt. If you do want to wear yellow in your bottom half, make sure it is "fitted" and your top is loose, and not the opposite as in this case. Solution: change the shape of the skirt to a pencil skirt, and ditch the print. Wear the print on top.

Sorry Jessica, that is Not a good outfit for you. Even if you have a great body, like she does, you can still make mistakes when picking what to wear.

Kim Kardashian:
Like her or not, Kim Kardashian already has a very defined waist, and big hips. The peplum is ideal for those women that want to "create" a waist.
In Kim's case the combination of peplum and a heavy weight fabric, like brocade, together combined with the brightness of yellow, make her look larger. Not a good choice. Solution: ditch the peplum, change type of textile to a structured but less decorated fabric, and she could keep the yellow.

Source: Bauer-Griffin Online

Source: http://fashionbombdaily.com