[Zarmonic]

Here's an idea...

It sounds like you just want a spell that turns you into a raven, as opposed to a spell that turns you into just any animal. That implies something particular to your own magical tradition, your style. Perhaps the GM would allow you to invent a perk for it. Taking the perk will allow you to treat including clothes as Lesser Transform Matter for that spell and that spell only.

I get this kind of thinking from Pyramid 3/66 and Magical Styles.