Cotton jersey pants usually having a drawstring or elasticized waist and elasticized cuffs worn especially for exercising. (noun-plural)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "sweatpants" in a sentence
"For winter, I did spend about $100 for winter running gear, but you could run in sweatpants and sweatshirt if you want to."
"There are many lifestyle benefits to running a home-based business: no commute, working in sweatpants and the array of readily available food in the kitchen refrigerator."
"Tavi says she knows girls in sweatpants aren't trying to make a statement."