The Collaborative International Dictionary of English v.0.48:

Rimple \Rim"ple\, n. [AS. hrimpele, or rimpel. See Rumple.]
   A fold or wrinkle. See Rumple.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Rimple \Rim"ple\, v. t. & i. [imp. & p. p. Rimpled; p. pr. &
   vb. n. Rimpling.]
   To rumple; to wrinkle.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

28 Moby Thesaurus words for "rimple":
   cocker, cockle, corrugate, corrugation, crankle, crease, crimp,
   crimple, crinkle, crumple, fold, furrow, knit, knot, plica, pucker,
   purse, ridge, ripple, rivel, ruck, ruckle, rumple, screw, scrunch,
   shirr, wimple, wrinkle