To bring us up to date, several items dealing with invisibility - two experimental, the rest merely dubious:
The first cloak of stealth: a regular invisibility cloak has the unfortunate effect that one is still audible, so unless a magus is stealthy he still risks being caught when spying. This cloak, made via experimentation by Lucien, covers four senses. Unfortunately it magnifies taste so much that if you accidentally brush past someone's lips or mouth, they will feel like they've just eaten something incredibly hot and spicy.
(The next level of PeIm past "destroy an object's ability to affect sight" is PeIm 5 destroy an object's ability to affect four senses, so this cloak is PeIm 5 +1 touch +1 concentration for total 15 +5 levels maintains concentration +5 levels 24 uses/day for total 25. Roll on experiment table gave a minor flaw, so it magnifies the sense it doesn't cover.)
The second cloak of stealth: Lucien tried to make a better version - this one removes the previous flaw, but weakens the effect on hearing species to make it slightly more useful as you can still use words when spellcasting.
(same as before, but the experimentation roll gave a minor benefit. Inaudibility is weakened, so you can cast in a quiet voice for a -5 penalty. You gain a +3 to stealth rolls when trying to move quietly as you are quiet but not silent).
Cost: normally 9 pawns for an invisibility cloak - Lucien sells the first one for a mere 8 pawns, the second one for 10 pawns.
The Emperor's new clothes: you can't see them, and they are so silky smooth you can't feel them, but they will keep you warm like regular clothes.
(PeIm 5, range personal, +2 sun, +4 levels to keep continuously on for total PeIm 19. You need someone with second sight to dress you or to wash them).
Story seed: A local noble has indeed paid good money for these (or a similar version sold by a faerie trickster), and is delighted by them. One morning, his usual valet (who has second sight) falls ill and there is no-one who can dress the noble in them. A servant has pretended to dress him, and the noble is wondering why he feels so chilly. Can anyone find the clothes (lost in the wash if the usual washerwoman with second sight isn't available) and stop the noble catching his death from cold? Can anyone persuade the peasants he is actually wearing clothes and hasn't gone mad?
The coquette's clothing - with a muttered phrase, these clothes become invisible allowing people to see the physique underneath. Currently popular in brothels frequented by redcaps. Cost a mere two pawns!
(PeIm base 4, +1 concentration, +5 levels 24 uses/day - PeIm 10. Made with an expires after 70 years so the Verditius can sell them to mundanes and make them faster)