Definition of "querpo"

Boy: my Cloake, and Rapier; it fits not a Gentleman of my ranck, to walke the streets in Querpo.

1647, Beaumont and Fletcher, Loves Cure

I would fain see him walk in querpo, like a cased rabbet, without his holy furr upon his back, that the world may once behold the inside of a fryar.

1681, John Dryden, The Spanish fryar