The UOP adds extra gear to the tutorial dungeon. While the gear does exist in the game files, the developers might have left it out on purpose, so that the player will not have a complete set of armor.
The additions are mentioned in the changelog:
-v3.4.0 (2011-11-06): "Fixed Tutorial dungeon Rough Leather Greaves (name was already corrected from Leather Greaves to match the rest of the set) using the male mesh when worn by female players" and "The chest in the tutorial dungeon containing the rusty iron armor will no longer be missing the gauntlets, and the skeleton with the rough leather gear will no longer be missing the helmet and gloves (the missing items have the tutorial script attached, but were not used anywhere in it, so they do appear to be oversights that they were missing)"
-v3.2.3 - Minor Update (2010-??-??): "The chest in the tutorial dungeon containing the rusty iron armor was missing a pair of rusty iron gauntlets." and "The skeleton in the tutorial dungeon with the rough leather gear was missing the helmet and gloves."
If these are already removed from the patch, the changelog notes are not crossed out and the removal is not mentioned.