From what I can tell the person who said iLvl dependent is probably correct, Common gear will sync to wearing common gear at that level, aetherical gear will sync to wearing aetherical gear at that level, Green gear will sync to wearing green gear for that level, and higher gear(AF, AF+1, Darklight, Primal Weapons,etc.) will sync to better than the green gear at that level depending on how high the ilvl is.