Descriptions of the Sack Coat from the
US Dress Regulations of 1861

Enlisted
Sack Coat (Fatigue Blouse) - 4 general service eagle buttons, fold over collar, one inside pocket, lined or unlined. Navy Blue wool.
1457. For Fatigue Purposes--a sack coat of dark blue flannel extending half-way down the thigh, and made loose, without sleeve or body lining, falling collar, inside pocket on the left side, four coat buttons down the front.
1458. For Recruits--the sack coat will be made with sleeves and body lining, the latter of flannel.

description from 1858 dress regulations

Officers
Jr. Officer Sack Coat (lieutenants and Captains) - Single breasted with 5 eagle buttons with “I”, “C”, or “A” in the shield, fold over, standup or civilian style collar, 3 outside pockets and 1 inside breast pocket. 3 small buttons (same style as stated above) on non functional cuffs. Optional velvet collar or collar and cuffs.

Sr. Officer Sack Coat (Magor, Lt Colonel, and Colonel) - Double breasted with 5 buttons in each row. Option of eagle  “I”, “C”, or “A” buttons or Staff Buttons, fold over, standup or civilian style collar, 3 outside pockets and 1 inside breast pocket. 3 small buttons (same style as selected above) on non functional cuffs. Optional velvet collar or collar and cuffs.

General Officer Sack Coat

                Brigadier General - Double breasted with 8 buttons grouped by 2 in each row. Option of eagle “I”, “C” or “A” buttons or Staff buttons, fold over, standup or civilian style collar. 3 outside pockets and 1 inside breast pocket 3 small buttons (same style as selected above) on non functional cuffs. Optional velvet collar or collar and cuffs.

                Major General - Double breasted with 9 buttons grouped by 3 in each row. Option of eagle “I”,”C”,”A” buttons or Staff buttons, fold over, standup or civilian style collar. 3 outside pockets and 1 inside breast pocket 3 small buttons (same style as selected above) on non functional cuffs. Optional velvet collar or collar and cuffs.

Description from revised regulations of 1861

Buttons - The button and configuration designate the rank and branch of service of the officer.
          18...For General Officers and Officers of the General Staff - gilt, convex, with spread eagle and stars, and plain border; large size, seven - eighths of an inch in exterior diameter; small size one - half inch.
                19...For Officers of the Corps of Engineers - gilt, nine - tenths of an inch in exterior diameter, slightly convex; a. raised bright rim, one - thirtieth of an inch wide; device, an eagle holding in his beak a scroll, with the word "Essayons," a bastion with embrasures in the distance surrounded by water, with a rising sun - the figures to be of dead gold upon a bright field. Small buttons of the same form and device, and fifty - five hundredths of an inch in exterior diameter.
                20...States, occupying one - half the diameter, and the letters T. E. in old English characters the other half; small buttons, one - half inch diameter, device and form the same.
              21...For Officers of the Ordnance Department - gilt, convex, plain border, cross cannon and bombshell, with a circular scroll over and across the cannon, containing the words “Ordnance Corps:” large size, seven - eighths of an inch in exterior diameter; small size, one - half inch.
               22...For Officers of Artillery, Infantry, Riflemen, Cavalry, and Dragoons - gilt, convex; device, a spread eagle with the letter A, for Artillery - 1, for Infantry - R, for Riflemen - C, for Cavalry - D, for Dragoons, on the shield; large size, seven - eighths of an inch in exterior diameter; small size, one - half inch.
               23...Aides - de - camp may wear the button of the General Staff, or of their regiment or corps, at their option.  
               24...For all Enlisted Men - yellow, the same as is used by the Artillery, &c., omitting the letter in the shield.
                                Description from revised regulations of 1861

Fabrics available for our
Union Sack Coats

Allow minimum of 3-5 weeks on Special Order Fabrics

21 oz.  Wool
also 13 0z available, for kids uniforms

Navy Blue

Button Configuration -

            2...For a Major General–two rows of buttons on the breast, nine in each row, placed by threes ; the distance between each row, five and one - half inches at top, and three and one - half inches at bottom
            3...For a Brigadier General - the same as for a Major General, except that there will be only eight buttons in each row on the breast, placed in pairs.
            4...For a Colonel - the same as for a Major General, except that there will be only seven buttons in each row on the breast, placed at equal distances ; collar and cuffs of the same color and material as the coat.  
            5...For a Lieutenant Colonel - the same as for a Colonel.
            6...For a Major - the same as for a Colonel.
            7...For a Captain - the same as for a Colonel, except that there will be only one row of nine buttons on the breast, placed at equal distances.
            8...For a First Lieutenant - the same as for a Captain.
            9...For a Second Lieutenant - the same as for a Captain.
            10...For a Brevet Second Lieutenant - the same as for a Captain. 

Description from revised regulations of 1861