Well, buy cashmere if you want someting warm and luxurious and budget is not an issue. Or maybe try a couple of John Smedley, cotton for summer/spring, merinos wool for winter.
Is there no consensus on this? Some are saying only cashmere, others are saying 'sea island' cotton and others 'merino wool'. I am very sure I want long-sleeve v-necks, so which online outlet can I find good oens at a good price? It is not my intention to wear them under sports jackets (it's just not my style; if I'm wearing a sports jacket I'll not wear a jumper).