Well, perhaps not quite so many, but today, most of the day, I've been wearing an old Alan Paine v-neck cashmere sweater in what I think of as 'schoolboy grey'.  In fact, I remember wearing it in the rather posh school I was working in in 2009 and feeling slightly self-conscious. 
Recently, I saw a Shaggy Dog being auctioned on Ebay Com., the colour of which was described as 'cement'.  I rather like that. 
Good for jackets, knitwear and trousers but not good for shirts and odd when it comes to shoes (although I owned a pair of grey shoes back in 1978). 
One of our great former posters, Harpo, the Welsh Blues enthusiast, once commented on the pale grey Shetland/dark denim look.  He liked it and I think he was spot on in his judgement.  It's refined, restrained; works well with a pale yellow Makes beneath. 
I also recall a favourite London Fog G4 that looked positively John Major-ish it was so grey.
As someone almost once but not quite sang, Sing If You're Glad To Be Grey...
But carefully does it.