Mo, I took the Nexx shirt home with me and dipped a corner of the tab (that holds the sleeves up) in water; totally ruined the sueded feel. I asked on the forum for success stories, and the results seemed to be mixed so I took it right back to Nordies rather than risk washing it for real.
OTOH, I bought the Equipment shirt and already hand washed it once. I know Rae Dryels hers (and I think Una was on the fence about her washing strategy?), but I had mostly positive results; the texture is the same, but the thread around the pockets shrunk infinitesimally. I promise you, no one except me notices (and only because I'm super self-conscious about my bust).
If you're looking for a starter silk shirt, I've been pointed at J. Jill's, which are both machine-washable and jaw-droppingly cheap. There were been a few mentions on the forum earlier in the summer, and you can probably find some YLFers who can comment in more detail. Right now, they're only $29.99! http://www.jjill.com/jjillonli.....&sk=M Sadly, J. Jill doesn't carry any of "my" colors -- hope you have better luck.
I agree with the others: the texture of heavy silk is like nothing else, and I adore mine. If money weren't a problem (HAH!) I'd pick up another one in a heartbeat. Good luck!