For Alice's tubes I'd agree with
xxxchihiroxxx. Just make long strips of fabric, sew them on one end and turn them inside out to make your tubes and then fill them with stuffing. Then sew them to her top. If you want them to stand up like they do and not just flop around you can always insert some modeling wire, though you'd then need to make a base against your body under the top to keep the wires erect. A bit more work, but not too bad, and you can find modeling wire fairly cheap at any art store.
Oh, and make sure that you have someone you really trust as a guide if you dare to go as The Bagged One. I know that I wouldn't like being tied up in a bag while trying to walk around.