I'm after a v fine knit black jumper, or several. Ideally quite slouchy and with long sleeves. If it comes in grey too that would be great. I see lots online but it's hard to know if they are actually thin - I bought a "thin knit" last year that was anything but. Can anyone point me in the right direction? Within reason, budget isn't a constraint (looking at you, Guardian fashion photo story with your £800 polo neck work wear suggestions!).