Magic items which bestow / enhance class abilities

[Apocryphile]

I know about the Monk's Robe and the Bane Baldrick, but are there any other magic items out there which do the same thing for other class abilities??

[Lacdannan]

Robes of Arcane Heritage for sorcerer bloodlines powers.

[williamoak]

You will find everything you want here:

http://zenithgames.blogspot.ca/2013/11/improving-your-class-with-items.html

[Rapthorn2ndform]

gloves of dueling for the weapon training from fighter.

[Bigdaddyjug]

Paladin has Bracers of the Merciful Knight.