shaggy faux fur cuffs for the shirt (maybe someplce colder than Texas you do a shirt collar too) then, get a werewolf face paint kit and see if he can grow his beard out for a little while. all you need then is black finger nail polish (and remover!), fangs and if u want, pointy ear extenders.
There are lotsof pics and some directions for good make up to help you out if u need it.
I don't know about the job interview, but the length and drape look fantatsic just like they are. It has a kind of chic sventieslook right now, but with a petticoat it wld be more fifties. Very versatile