A PVE crest costume should look like this :
2x Green crests EXP
1x Blue crest DDR 1x Blue crest PVE Damage Resist or 2x PVE Damage Resist
1x Purple 20% All Attk or 15 % DK Attk
1x Orange 26% All Attk
A PVP Defensive Costume should look like this :
2x Green 22% Max HP ( max MP might be used for mages and wizards )
1x Blue PKPVP Resist 1x Blue DDR or 2x Blue PKPVP Resist or 2x Blue DDR or 2x Blue Abnormal Resist ( depending on your build )
1x Purple 3% CC ( CC stands for Condition Cancel, meaning it will ignore a % of the opponent's abnormal status condition resist )
1x Orange 13% PVP Resist
A PVP Attack Costume should look like this :
2x Green ALL ATTK
2x Blue PKPVP RESIST
1x Purple ALL ATTK / DK ATTK
1x Orange PVP DMG BONUS