You may want to ask a woman what she finds sexy for men to wear.
I tend to have a longer list of what is NOT sexy for men to wear. One would be if they are wearing more jewerly than me, that is not sexy. If their idea of getting dressed to go out is putting on a clean, white undershirt...definitely NOT sexy.
I tend to notice sharply dressed men who appear to have made an effort, not just in their clothing but in grooming themselves.