Whms don't usually use this armor. Sure its good but Nobles and blessed one is alot better. Jobs thats best for Dalm is rdm and brd because they both don't have any other pieces that give +refresh on a body. Also refresh does stack (like rdm af2 hat and Dalmatica) so thats why u see alot of rdms wear that combination.
Another reason why whms and blms wear it is because of the rarity.