I thought that it might be Drapers.
I contacted them before asking if they offer private sales, but alas, only for a very limited range of fabrics. Seems that the full collection is not available to mere mortals. Darn!
Picture from last autumn in Florence when I had a fitting for two grey winter trousers. One pair of cavalry twills and one pair of Fox flannels. Looking forward to receiving one of them and have the final fitting on the other pair when Kotaro (Sartoria Corcos) comes back to Stockholm in March. Then I will also order my first bespoke suit!