The Collaborative International Dictionary of English v.0.48:
periwigged \periwigged\ adj. Wearing a peruke (a style of wig popular for men in the 17th and 18th centuries). Syn: peruked. [WordNet 1.5 +PJC]WordNet (r) 3.0 (2006):
periwigged adj 1: wearing a wig popular for men in the 17th and 18th centuries [syn: peruked, periwigged]