I was wondering, could a Coptic subdeacon wear a Syriac stole(epitrachelion?)? What about a Syriac subdeacon wearing a Coptic stole?
I've never seen any formal "legislation", so what follows is largely deduction, opinion, and experience.
The Syriac deacon's stole is called uroro
. The priest's stole is called, in the liturgical books, uroro rabo
("great stole") or hamnikho
("around the neck"). This last term is the equivalent of the Greek term epitrachelion
, and refers more to how it's worn than to the garment itself (which is essentially one and the same stole).
In all the Oriental traditions, the deacon's stole is essentially the same garment, a long strip of cloth, worn in various ways according to the rank of the wearer. So in theory, I don't see anything wrong with a Coptic subdeacon wearing a Syriac deacon's stole: the difference in the garment itself is more in terms of cut (Syriac stoles are more narrow) and ornamentation. The same would go for a Syriac subdeacon wearing a Coptic deacon's stole.
Ought this to be done? I suppose it depends on what the circumstance is. Generally, I would wear the vestments of my own tradition, even when serving in another tradition.