Here’s an interview with Kerso about his trainers and clothes. (He’s a friend of a friend, and I’ve witnessed his wardrobe in the flesh–truly awe-inspiring.)
I personally think people under estimated/completely ignore the influence the of the Edinburgh Festival on the Edinburgh crews. All the continental fashion on show for all to see and be influenced by for 8 weeks in the summer every year.–Mod, with an interesting theory on Edinburgh casual.