what a fab dilemma
have found a few possibles:
white company - viscose, so nice and breathable, along with great swishy drape
people tree - i like the satin edging details on this but it looks disppointingly unflattering on the model
boden - choice of colours/prints, tencel is like viscose, so same goos points there, v neck but sill decent i reckon
vintage ebay - not plain for but i think it would be rather lovely for dancing in
french connection my favourite of the lot, that pleated hem would swish beautifully, but maybe the skirt isn't full enough?