Best lounge wear/slippers/cashmere socks

[FashionFiend]

It's so cold in the evenings now! I'd like to treat myself to some nice, soft, snuggly lounge wear, slippers and cashmere socks.
Just for wearing while watching TV, I'd change into my pjs for bed. Can't decide whether to buy primark 'throw in the washing machine' slippers and spend money on nice cashmere socks or to buy some fancy slippers. What do you ladies recommend? Thanks!