What I expected to happen was...:
I expected that the skeleton with a leather cap would chase me.

What actually happened was...:
What actually happened, was that the skeleton with the cap didn't came out of the shadow.
But if I walked in the shadow, he was chasing me only in the shadow. but again if I was in the sun, He stopped following me!

Steps to Reproduce:
1. Put the command to summon a skeleton with a cap:

/summon Skeleton ~ ~1 ~ {Equipment:[{id:270} ,{},{},{},{id:298} ],Attributes: [{Name:generic.maxHealth,Base:50} 

2. Let the skeleton summon in the shadow, do that when you are in the sun. Before you do that do /time set 1000
3. Gamemode 0 and you see that the skeleton is not trying to chase you.
But it should do that.

To example the zombie will chase you!

   
 /summon Zombie ~ ~ ~ {Equipment:[{id:274},{id:},{id:},{id:} {id:298}],Attributes:[{Name:generic.maxHealth,Base:50},  {Name:generic.followRange,Base:100},],}