This cap came with the Mog - I would have to dig around to find it's origin, but it's very good. Hood down in this photo.

However it does microscratch the bonnet where the elastic ties rub slightly - so I've cut two neoprene buffers which hold under the ties.
Here's the John Taylor full monte - hood up

It rained torrentially all night - North Devon, and some wetness did get through onto the hood, but only a tiny amount which wasn't a problem. It's a great cover.