A longer jacket helps minimize broader hips and belly, while flat-front, wider-leg, full-length pants elongate the leg. Staying with the same color on top and bottom helps, too, but the good news is that you don't have to stick to dark colors alone to get the benefit.
Jacket, $69; pants, $39.50; both New York and Company. Shirt, Jones New York Signature, $59. Sandals, Payless Shoe Source, $16.99.