Frequently Asked Questions:
Q: Do boosts from gear stack?
A: No, You will only benefit from the last item of each type of boost you equip. So for example if you equip a +5% experience armour first, then equip a +3% experience cape, you're only going to benefit from the +3% bonus and not any experience gear boost from before.
However, different boosts can be used together (ex: reputation boost from cape, damage boost from weapon, gold boost from helm) and active timed boosts will stack with gear boosts.