The author, Dominic Trott (u/DMTrott) is an active redditor here. Very engaging and informative human being. As an accurate source of recent counter-culture history I cannot recommend him or his book enough.
Tracksuit? Like a full on three stripes Addidas track suit? Awesome. At one point, I bought a lounging robe as a joke. But it was actually super comfortable, and I really like it now. Seriously, every man should own one: https://www.amazon.com/gp/product/B00ZKDYHUQ/