I would likely wash it but I'm risky that way. I just won't do dry cleaning chemicals any more.
I would likely wash it by hand if I was really worried about an item, but my washing machine has a great Delicate cycle (always wash delicates on COLD/COLD setting) and I wash all my silk things in it. Use a very mild soap (not the regular laundry stuff. Baby shampoo or something similar. If you have hard water where you live you should add some Borax and let it dissolve.
Then squeeze it in a big towel to gently get as much water out as you can. I prefer to hang mine on a good hanger with a towel under it or in the extra shower (padded hanger if you have one) as the weight of the item helps smooth it while it dries.
Dry cleaning can shrink silk jersey from what I've read.
Some good info here:
http://texeresilk.com/article/.....ng_washing