Beyond the shape of the vestments there are other visual clues that can point to the particular era from which a vestment likely originates. These visual cues generally relate to either the particular textiles which are used (i.e. style and colour) or to the particular forms of decoration found upon them.
The Fifteenth and Sixteenth Century
The vestments of this period were frequently cut back into shapes that reflect later periods, but one of the defining characteristics of the period was the frequent use of stamped velvets:
However, not all velvets were stamped of course:
The Seventeenth Century
Vestments of the seventeenth century can be some of the most difficult to identify in the way we are discussing. The works that are perhaps the most readily identifiable are the embroidered works. Embroideries from this period are frequently very fine and intricate in their design, often accentuating the orphreys.
The Eighteenth Century
The eighteenth century was characterized by muted, pastel shades with meandering pattern repeats -- sometimes striped patterns. Metallic lace for galloons were also frequent features found in the vestments of the period.
The Nineteenth Century
Compared to the more muted and pastel tones of the eighteenth century, the nineteenth century frequently saw the use of very rich and dark colours, frequently paired with bold gold brocades with large and orderly repeat patterns.
I will take this opportunity to also note that one also sees, toward the later half of the nineteenth century, the introduction a symbols and saints into vestments -- something that would come to particularly define the vestment work of the twentieth century.
The Twentieth Century
As we turn toward the later part of the nineteenth century and to the twentieth, we enter a time that became fixated upon symbols -- whether that came in the form of specifically "ecclesiastical textiles" that had symbols woven right into the fabric, or whether we are referring to embroideries and appliques. Monograms such as the IHS, the Chi-rho become frequently seen, as do symbols such as crosses, saints, lambs and doves and so on.