US Army jackets were trimmed or specifically "laced" on the cuffs:
On the Army's Uniform coats (Frock coats for infantry, heavy artillery, etc.), the cuffs were a little more complex. there was a separate cuff piece put on the end of the sleeve and turned up, but finished with a cord or welt of branch color:
The cuff piece is a separate piece of the same cloth of the coat, attached to the end of the sleeve, and turned up over the cuff, and as noted, it was "edged" with a colored cord or welt, like shown on this one:
Confederate regulations called for cuff "facings" in branch color separate from the color of the coat, with the whole cuff of a separate color.
Here's the pattern diagram for Confederate regulation coats, showing the shape of the separate cuff facing, which I've annotated:
The facings were to be four inches long from the end of the cuff to the point, and 2.5 inches at the back seam.
Many CS jackets that are trimmed are frequently so with laced or cord applied rather than an applied facing or separate cuff piece;
There are some that had facings applied. This Confederate infantry sergeant's jacket has blue facings applied to the cuffs, but only on the outer half of the sleeve;
Many of the Confederate western theatre production jackets had a simple cuff facing. These were generally applied in the common manner, turned up over the end of the sleeve:
C.R. Childs sells a pattern for these as the "Columbus Depot Jacket" with the applied cuff facings to the sleeve:
crchilds.com
But there is at least one of these jackets made with the cuff facing an actual addition to the length of the sleeve:
Galla Rock Mercantile Views of an Original Columbus Depot Shell Jacket
www.gallarock.com
Silas Buck's late war western theater jacket cuff facings were also applied in the common manner, as seen by the holes worn in the colored facing;
As Les Jensen observed in his ground-breaking article, Survey of Government Made Confederate Jackets , there was a distinct style which he dubbed the “Department of Alabama” jacket. Jensen gave...
www.adolphusconfederateuniforms.com