Don't forget to put your club on the card rather than anything common like an address.
I take it you don't mean putting Arsenal in the corner? It would be real faux pas if the lady of the house turned out to be a Spurs fan. Of course, you could always play safe and put Wimbledon; at least they might think you were talking about Lawn Tennis.
And what's the latest on hats? I hear that the flat cap is somewhat 'on trend' this autumn. I assume that you are referring to some other sort of head gear or should I pop up in to the loft and see if I can find my grandfather's old flat cap which I think is in a box somewhere. Would hate to be under-dressed for a social occasion.