Impetus Question

Working up a spell to temporarily grant armor dice to normal clothing with the obstacle of the spell granting the equivalent of gambeson protection and extra successes being spent to improve it beyond that.
As normal clothing does not permit an armor test, and the Influence Impetus allows a test where there normally isn’t one (paraphrasing as I am away from my books) is this the right Impetus for the job, or do I need a more powerful impetus?
(Influence is less powerful than Enhance, and Enhance is less powerful than Control isn’t it?)

Please note, I completely forgot that I had asked a similar question back in December in Sparks (I lost my notes so I’m rewriting a lot of stuff from scratch).
But as long as we’re here, what do you think?