The one in the players bag shows the minimum stat that will be on the armour.
So when worn as any class you will have ATLEAST AC6-20 AMC2-10 HP+10 MP+10.
So stats would be like:
Wars - AC8-24 AMC2-10 DC0-4 HP+10 MP+40
Taos - AC7-22 AMC3-12 DC0-2 SC0-6 HP+20 MP+30
Wiz - AC6-20 AMC4-14 MC0-6 HP+40 MP+10
(Parts guessed - Taoists AC,AMC,HP+,MP+ - Wizard AMC,HP+,MP+)