I've got a pair of Halcyon WWII (style) googles which gives me that nastalgic look when out on the Thruxton. They are of exceptional quality (UK made) with clear (replaceable) glass lense.
I am able to comfortably wear my sunglasses beneath and when the light levels drop, I can simple just wear the goolges. They make them in a range of colours so you may be able to match them to your bike. When not in use, I sit them atop my 3/4 face helmet.
Available through Ghost Motors:
www.spookcycle.com