The cloak is made of heavy wool, and the style is inspired by this extant piece:
The cloak was created for the Baronial Archery Champion of my local SCA group to wear. The plan is for every Archery Champion's heraldry to be displayed on the cloak in chronological order of winning the Championship.
Cape of Garzia Medici -held at the Pitti Palace. See more info here:The clothes of Cosimo I, Eleonora di Toledo and don Garzia - Auris Lothol (auris-lothol.info)
(A big thank you to Salome for this reference!)
The wool is fulled and slightly felted, and so doesn't fray, which meant that it did not need to be lined.
There are currently two other Champion cloaks in use in my group; red for the Heavy Champion and blue for the A&S Champion.