Desperate to know what this is! A large, huge white hanging soft flower with velvety soft green leaves and ...

Question

just a hint of purple tint. It was growing wild and may be some sort of vine. It was growing in sort of a bush form but the plant seemed continuous.

Answer 1

Angels Trumpet seems likely.  Where do you live?  Does it freeze?  Angels Trumpet is frost sensitive.  Could you get a picture?

Answer 2

Morning glories and moonflowers come in white varieties and are vines.

http://en.wikipedia.org/wiki/Moonflower

Answer 3

Angel's Trumpet perhaps?