The bottom style enhance the look of the kameez you are wearing. You can choose from the various bottom styles but the style is restricted to the limit of the suit fabric.
Patiala is a loosely stitched salwar with lots of pleats and its very comfortable to wear.
Churidar are very long length bottom in which the excess length falls into folds and appears like a set of bangles resting on the ankle.
Don't like the Indian look for your kameez then try these straight pant style
These bottoms are loose wide legged pants.
Dhoti having multiple pleates with a broad divider between the legs.