I actually went about this making 2 pieces - the top and a corresponding necklace. I didn't have the patience to hand-sew all of the crystals onto the collar and then worry about how it'd do in the washing machine, so took the easy way out.
I made the top using a heavy weight cream-colored knit and a silk-blend herringbone fabric. I modified Butterick's B5520 pattern to become a tee-like top (with slimmed sleeves and chest), rather than a dress bodice. If you are sleeves-phobic, this is a VERY good pattern because all of the seaming is straight and you don't have to fiddle with easing a sleeve into an armscye (something I am TERRIBLE at). The peter pan collar was hand drafted.
The necklace is made from crystals woven into a collar pattern (trial & error) using Beadalon as the stringing material.
I've also been using my serger for narrow hemming some scarves, so be on the lookout for a scarf giveaway soon!