Funny you should mention this because a bunch of us were talking about it just the other day, in an attempt to form up an adjunct battalion for the 150th.. here's the guidelines that were published when it was formenting...
Navy:
Guidelines for CS Navy Impressions for Tucker's Brigade Adjunct: CLOTHING
CAPS:
Jean or kersey flat caps, plain (preferred)
Slouch hats (preferred)
Round caps/mechanics caps (preferred)
Late war jean RD issue kepis (acceptable)
BLOUSE/SHIRT:
Plain osnaburg/cotton collared shirts, with or without pockets (Preferred)
Collared overshirts of wool, flannel, jeancloth, or heavy cotton in various shades (blue, red, gray most common) (preferred)
Navy blouse in jean, English Army Cloth, or blue flannel (acceptable)
Federal blue wool blouses (acceptable if old and well used)
NO white cotton or linen navy blouses (jumpers)
Note: The plainer the better - the look is for laborer's style clothing with normal fall collars. Try to avoid the traditonal large naval collars and white collar on gray wool mainstream blouse (jumper)
Undershirts of cotton, linen, wool are encouraged. Citizen's/CS issue (preferred) naval cotton or wool (acceptable)
JACKETS
Blue wool or gray English Army Cloth naval jacket (Acceptable)
RD issue army jacket-modern Type III (acceptable)
NECKERCHIEF:
Black silk, light cotton (preferred)
Plaids, solids, and other shades of silk or cotton (acceptable)
TROUSERS:
Civilian or RD issue button fly trousers in jean, wool, English Army Cloth, or heavy cotton/linen (preferred) - these can be of straight leg or navy wide leg pattern
Traditional fallfront naval trousers (acceptable but discouraged unless highly aged)
FOOTWEAR:
Leather booties, import English shoes, or boots (preferred)
Canvas ersatz/camp shoes (acceptable)
Civilian leather boots (acceptable)
EQUIPMENT
LEATHERS/ACCOUTREMENTS
CS issue belts, boxes, cap pouchs, etc of leather or painted canvas (preferred)
English import equipment of leather (acceptable)
limited Federal equipment such as buckle or hook belt, pistol frogs, naval boxes, etc (acceptable but discouraged unless older)
KNAPSACKS/BLANKETS
Knapsacks discouraged but if needed, a CS issue or variant is acceptable
Blanket rolls are encouraged for this adjunct, and should be made from any mid 19th century wool or jean blanket of citizen's or military issue.
Groundcloth of painted cloth (acceptable but probably was not issued/carried)
Federal gum blankets and ponchos are discourage but acceptable if you need something to sleep on or protect from the elements
HAVERSACKS/CANTEENS
Although it has not been assertained that haversacks were issued, it is suggested to have one of common CS or civilian manufacture to store food and eating utensils in. Cotton or painted cloth acceptable
Canteens: CS or import (preferred)
Federal canteens (acceptable)
WEAPONS
To be discussed in further posts
TENTAGE
This is a campaign event, traditional martial tentage such as common (wedge) tents, Federal shelter tents, etc are discouraged. Tent flies of cotton duck or cotton drill is highly encouraged. Several 12x9 flies are being produced for this adjunct, but it is a good idea to procure ample sail cloth or duck cloth or pre-made tent flies to help weather the elements. Painted ground cloths are also acceptable to string up as shelters if needed
Marines may have been in Richmond Depot issued jackets in blue/gray kersey (English Army cloth) with near matching caps. Royal blue kersey or jean wool trousers, and many with English accoutrements.. for the most part looking very much like Army troops. here is a buddies impression of a late war Marine
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Even the army type shell jackets would have been worn open sailor style and not closed up among the Naval personnel, and buttoned up for the Marines.