pattern, adj. — Green’s Dictionary of Slang

pattern adj.

[abbr. SE pattern fair, mispron. of patron fair, ult. patron saint’s fair]

(Irish) excellent, first-rate, brilliant.

1801

M. Edgeworth Belinda (1994) 121: ‘O, lady Anne Percival is the best wife in the world,’ ‘O, lady Anne Percival is quite a pattern woman!’.