I don't know a lot about the price of silk chiffon, absent. Correction: I don't know a bloody thing about the price of silk chiffon. I think you are right though and it's synthetic, in which case, however pretty it is, I'm afraid my verdict would be Yuck. The 'feel' of my clothes is as important as the look. I couldn't wear even the most desirable-looking garment if it felt icky, as synthetics do to me.
My ball gowns (yes, I did have several at one time cos I went to lots of balls) were all cotton, some home-made, some bought, and all machine-washable. Laura Ashley was a good source before she died and the comapny lost its genius.