According to thishttp://www.uesp.net/wiki/Skyrim:Sneak#Remaining_Undetected, "Armor: moving in armor makes more noise, the combined weight of all equipped armor is correlated with its volume."

If you have the conditioning perk, your armor weighs nothing.

Cloth has small amount of weight, like 1 per piece. 5 total.

Does it mean if you have the conditioning perk, it's better to wear heavy armor than cloth when it comes to sneaking?