.. desperation..

A pleading post to the body painting newsgroup yielded not one, but two offers of help.

M.J.R.Dennis took the day off, went to Tussaud's and then discovered a queue of school children that stretched around the block. No chance of getting in at all. (But many thanks for the generosity and the effort.)
P.P.McGuir took the whole family there for the day, and scoured the whole exhibition, only to discover that Cher had been put into storage for a while. So again - many thanks for the generous offer and the valiant attempt.

So - we did a little dress designing of our own during the paint session. If it's not quite right - well, a lot of people tried hard - and this is our best guess.