Ah see, I think there's a theme, those who's DH/Ps moved from being looked after by their mum to their partner. I think this should be linked to the "at what age should your DCs leave home?" thread, because men who've never lived without a woman looking after them are rather different to those who had a gap between it being mum's job to look after them to being the DPs!
I guess it's that DH had lived alone for a number of years before I met him, if he didn't occur to him to buy clothes for himself, he'd have run out of clothes. For those who's DH would complain that they didn't have any, that clearly shows they believe it's your job/responsibilty. DH wouldn't complain he didn't have socks. If they are in the washing basket, I'll wash them, or he can. If they have holes in, it's his responsibility to buy more, or at least ask me to pick some up. It's not my job.
Naoko - there's difference (at least in my mind) between your DH asking you to pick some up when they realise they need socks, and it being your job to monitor if they are needed.