The runways of Milan taught a lot of us what NOT to allow our boyfriends/fathers/brothers to wear. Let's start from the bottom and work out way up.
Gentlemen, knee cleavage is not attractive. If you're going to show your knees, show your shins too. Long socks and shorts weren't cool when you're grandpa wore them, and they aren't cool now.
I personally have no issue with the "no socks" trend, but my fabulous nephew has informed me that it is repulsive, and so I'll cave on this one. I guess ankle cleavage isn't cute either? The only problem I can see is that those poor tootsies rubbing up against leather must give awful blisters. meh.