Ful semyly hir wympul pynched was,
Hir nose tretys, hir eyen greye as glas,
Hir mouth ful smal, and therto softe and reed.
But sikerly she hadde a fair forheed.

– Geoffrey Chaucer

The Canterbury Tales, General Prologue. The courtly appearance of the Prioress is described here: wimple pleated in seemly manner, fine nose, eyes gray as glass, small red mouth, and a handsome forehead. This fits with the nun’s own image of herself as a society lady, endeavoring to be something she is not.