Silk comes in so many weights, weaves and finishes. Mulberry silk is fine and made into fabrics such as crepes and georgettes which drape beautifully and lend themselves to blouses, kimonos, lingerie, full skirts and trousers with drape. (There is a heavier darker thread called tussah also known as wild silk; the yarn has an uneven slub which gives a rough texture used for suits, dresses, skirts and shirts.)
Lighter silk is best hand washed in warm water and shampoo, air dry and press whilst damp.
Cutting out with nap preferably single layer placing pins in the seam allowance. Sew with a microtex 70/10 needle, 2.5mm stitch length. If interfacing is required G785 is a very light fine fusible suitable for delicate cloth, which will keep the garment washable, if you use silk organza as interfacing then please dry clean.
French seams are ideal for the lighter drapey silks.