My fellow countryman, Peldrex (pictured on the right), claims to have found this spell, attributed to the mischievous Zanillo, in a musty old folio, purchased from an Orgovian.
As is typical of wizardly spells, it is hardly subtle, but I can assure you, it is rather handy, in matters both erotic and not. Most foes will hesitate on pursuing violence when they find themselves in the buff, whilst your paramour will be surprised, and one might hope aroused, by a sudden state of nakedness.