It is. A lvl 20 white sarong is exactly the same as the starting one. He wanted the sarong slot to use ruby, and he got it. Now if he wants to have other nice stats too. GUESS WHAT? INVEST IN INT.
Are you the guy who claimed that there is no hammer to be found in the game?
Rubies scale with the level of the item you use them on. Low level item = very low bonus from ruby.
Doesn't mean I think sarongs need to be changed. You can apply ruby to chest, belt, bracers, and helmet, and have 100% resistance to all elements anyway.
