Do apparel effects stack?

Constantinople

I have the speed stone and it does not matter if i wear one apparel with increases mundus stone effect or more. My speed is the same. So the armor effects do not stack? Same goes with reduces cost of sprinting?

Draconerus

These do stack, however whether it is working for the Steed stone or not I cannot say. Keep in mind the amount of added benefit you get is not substantially large and probably not something you would notice.

Constantinople

I did some testing. They do stack but the difference is indeed negligible and not worth it because you consume considerably more stamina for just a little increase in speed.

Draconerus

In your situation I would recommend just going with INFUSED and enchanting for stamina as it may be more beneficial.

Natjur

The Divine Stone buffs only effect a very small percentage of the buff.

So if the The Steed mudus stone gives a 10% run speed increase and a piece of armour with the divine stone trait gives a 6% increase to the buff you may not notice that cause.

10% * 1.06 = 10.6% run speed increase.

Now the second issue, is extra pieces of armor with divine stone appears bugged as the math it not what you would expect

You would expect two pieces of divine stone trait armor to give
10% * 1.06 * 1.06 = 11.2% run speed increase BUT they don't
Instead they work like
10% * ((1.06 * .06)+1) = 10.63% run speed increase.

I believe this is a bug and its been logged by many people who have worked out that same % (but using warrior stone as its easier to check the math)

But at the moment its not worth having more then one armor slot with divine trait.

Constantinople

@Natjur Aha! That is why it was much easier to detect difference in speed with one piece of mundus stone but more difficult with four more.