An outer garment worn by men and women that covers the body below the waist. They cover each leg separately, to the ankles. Trousers. Hot pants are "short-shorts" of the 1970s but the term dates from 1927.
Wow, hot pants go back to 1927. That leaves me panting. My breath comes in pants, with cuffs, a zippered fly, and a watch pocket. But I don't hike in pants. I use a kilt, albeit a manly one.