"protection"

[calighis]

For instance a ring or vest of protection + 1. What bonuses do they grant?

 

[ClemLOR]

Hi.

Ring of Protection +1: Deflection Bonus +1 (AC Bonus) (DMG pg 232)

About the vest of protection I am not sure; but I wouldn't wonder a lot if it is either an armor bonus +1, deflection bonus +1 or the same as with the cloak of resistance +1 ...

Greetings
ClemLOR

 

[Rackhir]

For instance a ring or vest of protection + 1. What bonuses do they grant?

The SRD is your friend for these sorts of questions.

SRD - Magic Potions, Rings, and Rods

Though there is no such thing as a "vest of protection" at least not as a stock magic item in the DMG. Though there is little real reason why you couldn't have a vest that does the same thing as a ring of protection.

SRD - Magic Wondrous Items

 

[Starbuck_II]

For instance a ring or vest of protection + 1. What bonuses do they grant?

Protection inplies deflection bonus. Example Ring of rotection.
Resistance implies resistance bonus. Example Cloak or Vest of Resistance.
And Natural armor implies natural armor bonus. Amulet of NA.

 

[washout]

If it was a vest instead of a ring it would be a non standard item of it's type, and would therefore cost more to produce or buy than a ring.

Per the SRD it's actually 50% more than a ring:


Body Slot Affinities

Each location on the body, or body slot, has one or more affinities: a word or phrase that describes the general function or nature of magic items designed for that body slot. Body slot affinities are deliberately broad, abstract categorizations, because a hard-and-fast rule can’t cover the great variety among wondrous items.
You can use the affinities in the list below to guide your decisions on which magic items should be allowed in which body slots. And when you design your own magic items, the affinities give you some guidance for what form a particular item should take.
Some body slots have different affinities for different specific items.
Wondrous items that don’t match the affinity for a particular body slot should cost 50% more than wondrous items that match the affinity.

 

[Starbuck_II]

If it was a vest instead of a ring it would be a non standard item of it's type, and would therefore cost more to produce or buy than a ring.

Per the SRD it's actually 50% more than a ring:


Body Slot Affinities

Each location on the body, or body slot, has one or more affinities: a word or phrase that describes the general function or nature of magic items designed for that body slot. Body slot affinities are deliberately broad, abstract categorizations, because a hard-and-fast rule can’t cover the great variety among wondrous items.
You can use the affinities in the list below to guide your decisions on which magic items should be allowed in which body slots. And when you design your own magic items, the affinities give you some guidance for what form a particular item should take.
Some body slots have different affinities for different specific items.
Wondrous items that don’t match the affinity for a particular body slot should cost 50% more than wondrous items that match the affinity.

You can make the case that improving AC is a class improvement. After all, it helps all classes.