Wear a pair of tight, skinny jeans or denim shorts with a loose-fitting V-neck T-shirt or baggy T-shirt to achieve Kristen Stewart's relaxed, casual look. Wear a cotton button-up cardigan or black imitation leather jacket and black driving gloves for a bit of warmth. Shop at stores such as Target, Forever 21 or Rue 21 to find nearly identical fashions for less than you would pay for designer-label brands.
Cuff the bottom of your pants if you plan on wearing open-toed heels, or leave them down if you are wearing tennis shoes. Limit tennis shoes to canvas styles made by Converse or Keds. Save money by buying a sub-brand made by Converse and sold at Target stores under the brand name Converse One Star. Save money on Keds shoes by buying look-a-likes made by Zoe & Zac.
Dress in high style by choosing colorful or short, black party dresses made of shiny materials such as taffeta or satin if you plan to hit the town. Formal prom-style dresses can be purchased at the discount stores listed in Step 1.
Complement the glam look with simple yet elegant high-heel shoes in dark colors or silver with a series of straps that can rise as high as the ankle. Accessorize your look with simple, trendy jewelry. Avoid dangling earrings and flashy or gaudy jewelry with large stones. Buy costume jewelry at stores such as Claire's or at mall kiosks.
Make a splash as Stewart is known to do at the MTV Movie Awards and the Nickelodeon Kids' Choice Awards by combining looks. Wear a formal dress with canvas shoes. Accessorize with long-hanging necklaces with pendants and a small handbag in the same color as your shoes. All of these items can be purchased at discount stores.