Odd observation of the day, but I've noticed a lot of female players in games - particularly STO - enjoy the skirts. My wife included, who's asked me to make her a Trek uniform, but only if she can have skirt options. A lot of female friends enjoy being able to wear dresses and skirts to work. Not all of them, but a fair amount.
With Starfleet being a less military orginisation (though even militaries have skirt options), if someone wants to wear a dress or a skirt.... why wouldn't they? Would equality become an era where we say "No, dress like the men!" and cut out an option that many feel comfortable and confident in?
I don't think it's worth debating to death. If they want to include dresses, fine. If not, also fine.
The only revision I'd make if they went to TOS for guidance is to use a fabric that maybe doesn't shrink. The hazards of that were seen on both sexes in the 60's - I half expected Kirk's sleeves to stop at his elbows as time went on.
Me too. I've spent far too much time on it

Realising my lack of any actual documentation, I've put up notes
here with a few pics, but it's more like a mad rambling. Though most of the stuff I put online is actual canon uniforms (
for example!) and I can bore people to tears with too much detail on each as I get far too carried away with things
I don't expect anything like my mad scribblings would end up mirroring anything in the real Trek world - but I am hoping that new Trek has a similar level of variation.
TNG had people doing everything from digging a hole to shooting aliens in a formal two piece suit. The Kelvin world had a nice variation - you have your bright and shiny mission outfit, your standard ground wear, formals, industrial/jumpsuit - everything had it's purpose; if a uniform is suitable for one thing, and not for another - change it. Put a coat on. Whatever it takes to make the sequence a bit more believable and visually interesting.
Jumping up a bit to skirts/dresses - having a unisex outfit to fit all, and optional variants (casual mens thing like Kirk had in TMP, casual womens dress/skirt) would make the show a bit more visually interesting than a one size fits all uniform. Which doesn't just help visually (or with believability), but if we go back to action figures (hopefully!) they sell better - and sell more - with variations.
Say the new female lead has her standard uniform, a dress variant, an away jacket, maybe an industrial wear/jumpsuit - thats four styles for TV, four action figures to sell, four costumes for people to wear at cons and possibly four 'moods' to mirror in a scene.