I have not seen these suits, but I will check the out on the next visit. The Isaia ones were made in the Marks and Spencer era for a season or two and are rare as hen's teeth. The few I have seen are the best made items BB has ever offered. They come up on eBay every once and a while.
Funny, I have an Isaia made BB suit in my closet. It's actually one of my favorite. At the initial time of purchase (from the then 6th floor of the 346 Madison main store), I was told by the salesman that it was made by St. Andrews. Comparison of the labels later confirm the Isaia origin.