Washed silk is silk with the nerves taken out. Two gentle washes before cutting mean the fabric has already shrunk, already softened, already decided what it wants to be.
At home
Cold water, a drop of neutral soap, no wringing. Roll it in a towel, hang it on a wide hanger away from the sun. Steam on low if you must; iron through a cloth if you know what you are doing.
A silk blouse cared for this way does not age — it acquires manners.
