When I was playing NERO I had the same kind of issue. With the girls in the chapters I used to play at they didn't really wear the same thing as the guys in their houses.... there wasn't even a girl version really. You were encouraged to coordinate your outfit (whatever it may be) with the House colors.
So, while in the Baronial court )the colors were royal blue, white, and a whole bunch of black) and being a fighter I wore:
a pair of lighter blue (think a couple shades darker than baby) harem-ish pants
A white or black puffy sleeved short chemise or poet shirt
A "doublet" I made from a simplicity pattern (3806, I just added more eyelets) which I made reversible one side black one side royal blue
And a full circle skirt in Royal blue
Generally I wore the skirt sides (left and right) tucked in to my belt so that the skirt wouldn't get in the way of fighting, but then if I needed to I could just pull them out and look frou frou. Or I could go without the skirt since I was wearing pants underneath anyway (all it took was one ill fated fall to teach me to always wear pants under skirts... even if there is no battling allowed). Making the "doublet" reversible helped with changing the looks while keeping it within the House colors, reversible items means more space in the suitccase.
I vote house colors, its easier as a girl to get costuming that way. Good Luck!