The closest thing we've found to a solution is Neutrogena T-Gel dandruff shampoo, which gives some relief, but isn't long lasting. I'm afraid the frequent baths are drying her out (even with Vaseline's clean-drying Moisture Lotion).
No, we're not crazy, just desperate. If it works and doesn't make her sick we're on it.
Back to the clothes... because she scratches she makes holes in her toddler-sized shirts. So we recently made a quick stop at the thrift store.
She's so funny - you should see her smile, yes, smile when she comes in wearing something new! Mouth slightly open, teeth shining, eyes bright. You can't see the eyes in photos and reflections make her look "possessed" but she's a happy dog, I assure you!