It is difficult to give you good answers with so little information. Important details about your project are:
1) How big is it?
2) How old is it?
3) Do the edges have to show?
If you want to mount a new silk scarf, then lacing with fine thread is OK -- especially if the edges don't have to show.
If the edges have to show, then baste it to another piece of fabric, and stretch that.
If you want to mount an old, fragile piece of silk, such as a flag from the Civil War, do not attempt any sort ofd stitching. Even the slightest pull would shatter the silk threads of the weave.
The next issue of PFM is supposed to have an article about mounting old, fragile textiles with edges showing. The fine mesh overlay mount works for almost any size and condition of fabric. Essentially, the textile is sandwiched between sturdy background fabric and a fine mesh fabric overlay. But of course it's not quite that simple.
The magic of this kind of mount is that it maintains slight tension & keeps the textile from moving within the mount. That detail of the method is thoroughly described in the article, with photos.
