Fantasy ball dress - for a Hogmanay party in a Scottish castle

While looking for a J Crew cashmere picture to illustrate my previous piece, I came across this ravishing dress. It's no secret that J Crew are looking to up their fashion quotient (& with it, their price point), and I was somewhat sceptical. After all, if I am going to drop serious money, then it's unlikely to be $1800 on a piece from the equivalent of the American High Street. But a dress like this, in such luxe fabric...maybe*... esp now that I know that the cashmere is from Loro Piana.
The dress has a tulle underskirt for volume, and the back has a very deep V neck wich ends in a pretty bow. The bodice is made from a dense 9-gauge Milano knit for structure, while a looser 7-gauge flat knit gives the skirt a flowing drape.

To be honest, I can't really think of many occasions where it would be practical to wear a cashmere balldress: it's going to be way too hot for dancing in central heating obsessed America. But it would be perfect for a black or white tie party in one of those freezing cold Scottish castles, (or even the arctic village hall in Scourie in Sutherland in the Scottish Highlands where we spent one truly bonkers NYE), and it would look great with a Clan sash draped across it.

*when I win the lottery