3 Purfled with gold and pearl of rich assay,
Purfled > {Embroidered along the edge; trimmed with metallic lace, pearls, etc.} assay > quality; proven worth
4 And like a Persian mitre on her head
mitre > head-dress; sacerdotal head-dress (often associated with episcopal office or dignity)
5 She wore, with crowns and ouches garnished,
ouches > {Jewels; golden sockets to hold these}
6 Which her lavish lovers to her gave;
lavish > lavish; licentious
7 Her wanton palfrey all was overspread
wanton > playful, unruly; wanton palfrey > {Saddle-horse for ladies}