Nah, that Avatar is a character named Assallya, a D&D character I've had since I was a wee bairn. Though it wouldn't be the first time I had Sarah play as Assallya in D&D adventures in the danger room (In addition to a Star Wars game!). I rather suspect that there are quite a few rumours of Sarah's promiscuous activities concerning the danger room. Ah... if such holographic wonders truly existed...

Sarah's costume is nothing more than a formless mist that is looks very much like a dampening of the light around her figure. She's basically a naked person behind a black veil, If one looks closely, one can see just about everything. She'd probably wear a normal costume if it wasn't for the protective nature of the stuff. It functions better than Kevlar. It's also why if you hit her with sudden intense bursts of light her costume fades away unless she puts more effort into it.