Sketches for Uhura

When the show became more fashionable, they did this assymetrical darting on the female uniforms with a overlap at the front of the skirt.
Front length would be as short at it was on the show,  graduating to full floor length in back.
Outer fabric all red, visible lining all black, including neckline.
Hem of skirt has wide horsehair braid to keep it flared out.
Comm badge can be lego or rhinestones, or both.  Also can be larger if you want more of a lego presence.
Jewelry can also be lego if desired.

Very fitted bodice, most likely stretch is you are comfortable with it.  Completely off-shoulder with stand up black "collar" which can be lego if desired, but does not have to be.  Collar should be made of same materials as belt.
Drawn with sleeves, but can be left off.
Skirt is  fitted to below the knee, then flared out the back, large flare in front.

Most structured, I would say.  Fitted red bodice with assymetrical black collar, black 2 layer skirt.
Top layer skirt full circle (maybe more) with horsehair at hem.
Underskirt structured hoopskirt or maybe even super-voluminous black tulle crinoline.

Main dress same shape and length of original costume (forgot to flare skirt out, in sketch, though...)
Super-voluminous train attached at back slightly lower than waistline.
Large assymetrical black collar can be made out of lego, or just comm badge.
Long black opera gloves.

Floor-length column red dress with black collar (or red collar with black lining visible, which I think would look less costumey)
2 layer half-circle train that can "inflate" while walking.  Outer layer red, inner layer black.
Collar can be made of lego or just comm badge.  Comm badge can also be made larger if desired.
Legos can also be sewn onto most of these as trim, like a rhinestone starburst except with lego, but I don't know how much artistry that would entail for Nathan since it doesn't really involve sculpting anything.