You can turn to some of your closet basics to dress up like Katniss. Wear a green v-neck t-shirt with a black hooded coat. Then braid your hair, grab a fake bow and arrow, and be sure to add a Mockingjay pin.
Effie's all about the big curly wig, bold-colored dresses, giant flower pins, and bright makeup. Bonus points for copying Effie's glitzy manicures.