Basically wear what you want to crash in.
Wise words. Round glacial pebbles on top of pavement create a very risky surface. I slid my Vee this past summer near Consul Saskatchewan on hwy#13; an old paved road that had been resurfaced using deep gravel. I knew it was risky and was riding at a speed (about 60kph) that I felt comfortable to crash in. Minor scrape on the Vee and just dust on my Aerostich Road Crafter suit.
Wear what you want to crash in.