1876 (Harvard Univ.) 28 Sept. p. iii/2, (advt.) Boating suits, running pants, etc., made to order.
1930 L. W. Olds i. 4 The running pants should have plenty of room in the hips.
2005 Oct. 85/3 To go commando or not is a question many a runner has to confront... Personally, I'm a convert to special running pants.