The Collaborative International Dictionary of English v.0.48:

nonreversible \nonreversible\ adj.
   Not reversible or capable of having either side out; -- used
   mostly of clothing. Opposite of reversible.

   Syn: one-sided.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

nonreversible
    adj 1: not reversible or capable of having either side out [syn:
           nonreversible, one-sided] [ant: reversible, two-
           sided]