The Collaborative International Dictionary of English v.0.48:

Legging \Leg"ging\ (l[e^]g"g[i^]ng), Leggin \Leg"gin\
   (l[e^]g"g[i^]n), n. [From Leg.]
   A cover for the leg, like a long gaiter.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Legging \Leg"ging\,
   a. & vb. n., from Leg, v. t.
   [1913 Webster]

WordNet (r) 3.0 (2006):

legging
    n 1: a garment covering the leg (usually extending from the knee
         to the ankle) [syn: legging, leging, leg covering]