Several such cloaks were created by the Brothers of Bastir for their priests on dark pilgrimage.
The Coat of Arms looks and acts like an ordinary riding cloak.
Created so that the wearer might hide weapons on their person and if searched, the weapons could not be found. The uses can range from concealing murder weapons, to simplifying the assassination of influential individuals, the possibilities are numerous. The weapons in question can not be much larger than a shortsword or crossbow, but crossbows, daggers, shortswords, all seem to vanish when the wearer places them in the cloak. Up to twenty weapons may be concealed in this way.
The cloak has a powerful enchantment and is impervious to all mid level and lower magical detection. The Coat of Arms cannot conceal any extraordinarily powerful objects.
In anti-magic zones the weapons may be either inaccessible or may randomly fall out of the wearer's cloak.
Occasionally, the wearer might find a weapon that a previous owner would have concealed. This can range widely from the macabre to the humorous upon the GM's discretion.