Dormin says the following upon retrieving the item:
That is the "Cloak of Force"... By wearing it, thou shalt be able to inflict more grievous injuries upon a colossus...
Unlike Wander's regular cloak and the Shaman's Cloak, the Cloak of Force does not feature the major sigil symbol. The Cloak is identical to the cloaks that two of Lord Emon's men wear, that also lack the major sigil symbols.
Wander wearing the Cloak of Force.
Lord Emon and his men entering the Shrine of Worship. Note that the first man on the left and the second man on the right wear cloaks similar to the Cloak of Force.