Hit

Quality Modifications

Ivory: +0%
Bronze: +1%
Iron: +2%
Mythril: +2%
Denadorite: +3%
Rainbow Shell: +4%

Type Modifications

Axe: -1%

Character Hit Modifications

(Based on the character's stated accuracy)
80%: +2%
85%: +0%
90%: -1%

The result of this is that essentially, the possible character accuracies are 82%, 85%, and 89%. Why they aren't displayed this way in the game is unclear.

From: Weapons (Chrono Cross)