Hi Fly.tier,
Randall Kaufmann's book, "Fly Patterns of the Umpqua Feather Merchants" has the White Wulff pattern like this:
Hook: Dry Fly, 8-16
Thread: White 6/0
Wing: White calf
Tail: White calf
Body: White dubbing or yarn
Hackle: Badger
(I changed the hook from "TMC 100", to "dry fly")
Regards,
Gandolf