Muslin is fine, but perhaps shoot them in Black and white? I don't particularly like the way most muslin's look in color. Also, don't put the lights 45 degrees and eye level, use kickers to create some depth.
so what is the ideal angles. I usually go by 45 up and 45 to the side. So use alot of side style lighting. Thanks for the help guys.
Anywhere besides 45 degrees and eye level. Try something different, try using only 1 light, right above and behind you for some butterfly style lighting, or put it about 45 degrees, but behind them with the light towards you. Look at other boudoir photos and dissect how they lit them.