Stormtroopers are one of the most distinctive characters out of the Star Wars universe.
Also one of the hardest ones to cosplay, in part due to the large amounts of armor required.
Most distinguishing characteristic:
White armor, white helmet, white belt.
With a distinctive helmet and armor platting, one can not just throw on a white shirt and pants and call it a day. A little extra work needs to go into the creation. Even something as simple as drawing the outlines of the plate armor onto a long sleeve shirt, or adding arm and knee pads for the dark under armor spots in the overall design.
Unless looking to combine the distinctive helmet design with a more easily created costume in a mashup display, some extra work is needed for this costume. Good Luck.