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Chaps are a leather garment worn over pants. They only cover the legs, and have no bottom or crotch. They are usually worn by cowboys, to protect them from rope burn or being scratched while riding through thorny bushes. Chaps are usually made from leather, and modern chaps as seen at rodeos can be very bright and colorful.
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A gap is a small space between two things, or a small break in something continuous like a fence. A gap can be measured in distance, like the gap between the two buildings in the picture, or it can be measured in time. For example, some people take a gap year between school and university.