If I want to wear a cardigan it is because I am cold. I want the whole thing to be snuggly warm...sleeves and all.
I have seen some gorgeous grey cardigans with a wide collar today only to be disappointed that someone has chopped the sleeves off.
Short sleeved polo necks is another thing I don't get.
If I want to be warm I want my whole body warm. If I want to be cool I want my whole body to be cool....