A revers or rever is a garment or part of a garment that is reversed to display the lining
Lining (sewing)
In sewing and tailoring, a lining is an inner layer of fabric, fur, or other material inserted into clothing, hats, luggage, curtains, handbags and similar items....

 or facing
Facing (sewing)
In sewing and tailoring, facing is fabric applied to a garment edge, on the inside. Shaped facings are cut to match the outside shape of the piece to provide a neat finish, and are often cut from the same pattern pieces. Shaped facings are typically made of the same fabric as the garment, but may...

 outside. The word is a corruption of reverse
Reverse may refer to:*The reverse side of currency or a flag; see Obverse and reverse*A change in the direction of:**the movement of a motor or other prime mover; see Transmission **an engineering design: see Reverse engineering...

. This is most commonly the lapels or cuffs, and the term is mostly used when they are made in a contrasting material. The term became current in the late 1860s
The 1860s were an extremely turbulent decade with numerous cultural, social, and political upheavals in Europe and America. Revolutions were prevalent in Germany and the Ottoman Empire...

 at the time when dress coats were no longer buttoned up but worn with the lapels opened up and turned back, thus the revers was one of the few opportunities for adornment on the otherwise plain black coat.

In the 1890s
The 1890s were sometimes referred to as the "Mauve Decade" - because William Henry Perkin's aniline dye allowed the widespread use of that colour in fashion - and also as the "Gay Nineties", under the then-current usage of the word "gay" which referred simply to merriment and frivolity, with no...

a small 'jaunty' jacket with each lapel turned fully back was termed a 'rever'.

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