You can tell by the way they part their hair.

Also, he doesn't have to part his hair any more.

One, when we found Bill, his hair was parted the wrong way.

I parted my hair a certain way, to look younger.

His dark hair, long and straight, was parted in the middle.

He tried to part his blond hair on the side, but it refused.

The hair on the crown is parted in the middle.

I doubted that he could successfully part my hair with it.

He parted his hair a little more towards the centre.

Long straight black hair was parted down the middle, and his teeth were better than Gary's.