The two biggest things I've noticed when I've had to wear clothes made for men:
1) their torso's are longer, shirts come down to my crotch.
2) they have no curves. There's always this bunch of fabric around the waist that should be fitting closer.
As far as items such as shorts, I suppose that the chamois is different, but I'm not sure, but this is why I won't wear men's jerseys.
While we're on this topic, has anyone ever tried the MEC jerseys?? Their basic one for women fits me awful, they feel to me that they are just trimmed down men's jerseys. Is this just me, or do they fit other women well??