Well, presumably there were female humanoid enlisteds and NCO's aboard TOS-era Federation starships, including the Enterprise. So if there were no other appearances of women wearing jumpsuits outside of Chapel's surgical garb, I would find that to be a far greater omission than whatever the dress code would be for female command-grade officers.
There are enlisted women, Rand and the other yeomen most prominently, most specifically ID'd with Yeoman 3rd Class Lawton in "Charlie X." Angela in "Balance of Terror" is often cited as enlisted as well, but I don't think that's screen canon.
Enlisted personnel apparently wear the standard uniform with no grade insignia, the same as ensigns. Not very satisfactory, but there it is.
I have never seen any meditation, even in fan circles, on what
warrant officer rank insignia would be.
An old fan publication from the '80s, Shane Johnson's "Uniform Recognition Manual," used straight-edged silver braid, narrower than the wavy officer braid, for warrants. Two stripes for CWO and one for WO, IIRC.
I don't think it was ever established that Starfleet had a warrant officer program. Hell, you have to do more than a few twists to pick out enlisted personnel.
I know. But I figured that if they're going to parallel Earth's Cold War naval organizations in so many ways, why not have warrant officers as well? It would go a little ways toward explaining the liberal use of the word "chief" throughout the franchise.
Well, by the mid-1960's the Air Force had already abandoned creating new warrant officers, and the Navy was in the process of phasing them out as well, to be replaced with Limited Duty commissioned officers. This never came to pass, of course, but maybe WOs were thought of more as a thing of the past than the future at the time. More likely they were just not considered at all.
Most nations today do without the in-between class of warrant officers that the US uses, so I don't think it implausible that Starfleet would not use them, either.
"Chief" in the US Navy refers to a chief petty officer, not a warrant officer.
I think it would also be an interesting exercise to come up with a Starlfeet-style sleeve marking for warrant officers anyway...
Or even more so, enlisted insignia. A FASA game manual from the '80s had some upper-sleeve enlisted insignia, combining the "arrowhead" and chevrons. It would be nice to have something like that "remastered!"
--Justin