Equipping a piece of Equipment increases a unit’s stats (also a requirement for raising JobLv) A piece of Equipment cannot be removed once it is equipped.
Green: Can be equipped now (You own this Equipment and Unit Lv is met)
Yellow: Cannot be equipped yet (You own this Equipment, but Unit Lv is not met)
None: Equipment not owned
Note: If you do not own the Equipment, but possess the required Fuse Material to Craft it, a yellow "+" will be displayed.