This I understand - I say again, though, I have a hard time believing that they were developped in contradistinction to the West. In fact, they simply weren’t. Making Servus Pio XII’s comment odd to me.
More correctly, in isolation from each other…
The syriac priestly vesture and the byzantine, while very different, show signs of common ancestry:
A sticheron, the fundamental garment of men of the middle and near east…
A stole of office, a belt to hold it in place
Cuffs to keep the sticheron sleeves out of things, especially the holy gifts.
A great cloak or great mantle (WHich the phelonian essentialy is), or a heavy over-tunic (the dalmatic and saccos).
Appropriate headgear (klobuks, mantles, or priestly hats…)
The crowns of the bishops and archpriests, showing their place as equal to the nobility.
Appropriate shoes.
And the Roman:
The cassock, a robe of the wealthy classes, but in black.
The Alb, a robe of older, roman cut, worn over in tradition to show purity.
The Amice, a hood worn under the Alb, yet over the head.
The stole of office. A cincture (belt) of rope to hold it down.
The maniple, a sweat rag, that grew all out of proportion… and then was done away with…
The overgarment, be it dalmatic, chasuble, or cope
The hat of the priest, removed for liturgy.
The bishop’s miter, a cloth crown, very different from a civil coronet, and yet, worn in the same kinds of circumstances… only later reducing in use to the liturgies. It shows the same kind of God-given authority, but for different realms and reasons.
Fundamentally, both have origins in the common clothing of the upper classes.
And, having made roman vestments (diaconal) for my dad, they are simple and straightforward, like almost all 3rd to 6th century roman garments. Also, they are often (now) of simple but rich fabrics. Dad’s rose set is of watermarked upholstery silk we found for under $10/yard… but he only gets to wear it twice a year.
Now, one can find suitable fabrics well under $40/yard… but they are still in the $20/yard+, except as endlots. And if one is lucky and/or patient, end lots of up to 5 yards often get discounted.
Google vestment fabrics
Found a nice ivory & gold for $14/yd plus shipping right off…