There are lots of X +20% weapon/armor abilities.
If I have a character who has 255 of stat X, is the weapon/armor bonus still applied?
Final Fantasy 10 – Are Maximum Stats Still Boosted by Weapon Abilities?
final-fantasy-10
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Best Answer
The final result is affected by the percentile increase, but not the (hard-capped) stat itself.
For example: the strength stat is hard capped at 255. The only way to actually raise the strength stat now is by using Cheer 5 times, making it 260.
Now you equip a weapon with +20% Strength. This does not increase the strength stat by 20%. It affects physical damage directly, instead. This goes for all similar abilities.
So while the weapon/armor ability will increase the damage you do, even at the hard capped value of 255, it does not increase the stat directly.
Sources: here and here