This submission is actually long overdue. The sketch is actually dated all the way back to November 12, 2011 and there's a bit of an interesting story behind it.
There are several official "Star Trek" fan clubs that style themselves after actual in-universe military organizations. STARFLEET International models itself on the "navy/coast guard" branch that we all know from the TV series and movies, while the Maquis Forces International are a slightly less formal group that imitate the "rogue" ex-Federation elements seen in TNG, DS9 and VOY.
However, there is also STARFLEET International Marine Corps and this group claims to be a never-seen but existing Starfleet equivalent of the present day United States Marine Corps. The Starfleet Marines and Maquis all use different "uniform regulations" for their club members, and the most famous (among the fan club circles) of these uniform variants was the "Monster Black," a black version of the classic double-breasted red jacket (Monster Maroon) from "The Wrath of Khan" with no sleeve band and a system of rank insignia and color codes unique to the Starfleet Marines.
is the daughter of a U.S. Marine, so I thought it would be a neat idea to commission one of these Starfleet Marine dress uniforms for her. Later on, she asked me to redesign it a little to make it more unique (and to also avoid anyone mistaking her for a club member, which we were a bit worried about). I started out trying to make small, but striking modifications that could be easily done in a local alterations shop, but got more into the project while I was at it.
The final result, which my friend wore to Ichiban 'Con 2012 in Charlotte, NC, sported a number of small but very visible design changes that I even managed to tie in to my own "Star Trek" fan fiction universe. I worked out reasons for each change and what every piece of the uniform stood for, and then worked it into the way I wanted my version of the Star Fleet Marine Corps organized.
Ironically, I would end up posting my fiction notes on Deviant Art first: [link]
This outfit is also briefly described in that written submission, but I'll repeat it here because the notes are a bit lengthy:
"The Class-A (undress) uniform is the standard service uniform of the Marine Corps, worn on duty at ships and facilities whenever a Marine isn't expected to engage in heavy field work or active combat.
At first glance, it looks like a black version of the red Class-A undress tunic used by the regular Star Fleet's officer corps; it is made from largely the same pattern, though it finishes slightly higher at the bottom and uses much of the same insignia in the same places.
Rank insignia is pinned to a color-coded shoulder strap above a globe-and-anchor Marine Corps pin, "pips" and "squeaks" indicating 1, 5, or 10 years of service are worn on a separately color-coded sleeve band, a special security code transmitter is pinned to the rear of the shoulder strap and finally, a large officer's badge is worn on the chest with a miniature one worn above the sleeve band.
However, the Marines wear a stylized globe-and-anchor patch on one arm and a shoulder board on the same or opposite shoulder; this shoulder board features a button bearing the Great Seal of the United Federation of Planets on one end, and a special "Star Fleet Command" badge indicating the wearer's department (usually Military for Military Assault Command Organization) on the other.
Unlike the regular Star Fleet tunic which features a black belt, Marines wear white belts with brass buckles. The undershirt and shoulder strap are color-coded to represent the general category of the wearer's rank, with colors for General Staff, Company-Grade Officers, Field-Grade Officers, Warrant Officers, Non-Commissioned Officers and Enlisted Personnel.
However, the shoulder board, a slash on the shoulder strap, the sleeve band and the front belt loops are all colored a particular shade of deep green. This feature is shared by all Marine uniforms and the green color was quickly dubbed "Marine Green" - it symbolizes the spiritual brotherhood shared between all Marines, no matter what their race, gender, rank or job may be."
Finally, the only thing the final costume has that you don't see on this drawing is a leather peaked cap (actually a biker hat) with an attached button badge bearing the crest of the Star Fleet Marine Corps.