Not the best image of my fighting gear, but considering that I only took the field one day this past Rag, I should feel lucky that there's even this image.
What you can't see in this picture is that the white "tank top" looking thing is actually an underdress that I wear under my armor/corset (and I do plan on dying it a darker color to get away from the OMG WHITE). Under that, I generally wear some sort of pants (that day it was poofy pants that gathered at the knee). Over all that, I usually wear my tabbard (I had given up on it at this point for some reason). My sunglasses are really the only obviously modern thing I'm seen wearing in the picture.
If I'm not wearing my armor when I fight, I pretty much wear whatever garb I threw on, as long as it's not some of my nicer stuff. Half chemises are really great and super easy to make (think basic t-tunic pattern, crop it to about your natural waistline, and put a drawstring/elastic in in the bottom hem). Cholis and ghawazee coats are nice, too (and honestly, I don't give a rat's ass if they aren't historically accurate, they look more appropriate than half the stuff women wear out there now).