The Collaborative International Dictionary of English v.0.48:
Seersucker \Seer"suck`er\, n. A light fabric, originally made in the East Indies, of silk and linen, usually having alternating stripes, and a slightly craped or puckered surface; also, a cotton fabric of similar appearance. [1913 Webster]WordNet (r) 3.0 (2006):
seersucker n 1: a light puckered fabric (usually striped)