The Collaborative International Dictionary of English v.0.48:

Seemly \Seem"ly\ (s[=e]m"l[y^]), adv. [Compar. Seemlier;
   superl. Seemliest.]
   In a decent or suitable manner; becomingly.
   [1913 Webster]

         Suddenly a men before him stood,
         Not rustic as before, but seemlier clad,
         As one in city or court or place bred.   --Milton.
   [1913 Webster]