I'm not sure how much you guys care about lesser-known gameplay trivia, but I figured I'd share my findings here anyway.

A couple of days ago, I did some experimentation with armor to confirm certain suspicions I've had for a while. As you probably know, there are various sounds your character makes while walking, depending on the armor they're wearing. To my knowledge, the three distinct sounds are jingling, rattling of plated armor, and a muffled cloth sound. However, as it turns out, the sound your armor makes actually has a gameplay effect. While wearing "cloth" armor, you can approach enemies slightly closer before they detect your footsteps. Here is a video showcasing it. The Sunlight Altar bridge makes for a good demonstration spot, because the protruding stones right down the middle work well as indicators on the ground.

There are a few things to note. First of all, it goes without saying that this has almost no bearing on regular play, and it's more of a curiosity than anything else. Second, although I didn't show it in the video, armor noise appears to have not matter while walking slowly - or if it does, it's barely noticeable. Finally, I'd like to say I've only scratched the surface here. The things I have not done include: Testing other enemies, double checking to make sure there aren't more armor sounds, checking if non-chest armor matters in any capacity, sprinting, weight... the list goes on. And to be frank, I doubt I will ever do any of that.

As it stands, this is just an undocumented (at least I think so), useless gameplay oddity. Still, the attention to detail in this game continues to astonish me.

Sound can have an impact on how you play Dark Souls as enemies are aware of the noise you make. I personally hit walls with my weapons to make noise and that would attract enemies that didn't have aggro on me. Walking vs running also had an impact. Look no further than these spells for further proof.

Aural Decay: Fires a projectile which creates a sound wherever it collides with a surface. This attracts the attention of enemies in a way similar to Alluring Skull.

Fall Control: Grants buff that removes damage and noise from fall.

Hush: Masks all noises of the caster.

EDIT: I forgot to mention backstabbing. If you have light armor and you slowly approach an enemy from behind you can get an easy backstab. Try walking normally or sprinting towards an enemies back and they'll turn around before you even get close to backstab distance. You can try this from the bonfire above andre from astora. Kill the undead outside the church and then head to the nights with their backs towards you.

It's crazy all the things that go on in this game.

The attention to detail is amazing. Love the little things you can catch